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1. Shard Calculation

Query:

Response:

Calculated Shard: 185 (from laksa015)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa185.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.medschoolcoach.com/fluids-hydrostatic-pressure-mcat-physics/\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.medschoolcoach.com/fluids-hydrostatic-pressure-mcat-physics/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.medschoolcoach.com\/fluids-hydrostatic-pressure-mcat-physics\/","crawl_time":1775795575,"first_indexed_time":1644180572,"http_code":200,"src_unparsed":"com,medschoolcoach!www,\/fluids-hydrostatic-pressure-mcat-physics\/ s443","src_root_hash":"5035666356221790585","history_drop_reason":null,"meta_title":"Fluids – Hydrostatic Pressure – MCAT Physics | MedSchoolCoach","meta_descriptions":["Learn about the difference between hydrostatic pressure and absolute pressure, as well as how to solve fluids problems on the MCAT testing hydrostatics!"],"attrs_boilerpipe_text":"MCAT Physics Topic\nHome\n»\nMCAT Masterclass\n»\nChemical and Physical Foundations of Biological Systems\n»\nPhysics\n»\nFluids – Hydrostatic Pressure – MCAT Physics\nSample MCAT Question: Fluids\nHow are hydrostatic and absolute pressure different?\na) Hydrostatic pressure and absolute pressure are the same thing.\nb) Absolute pressure is the pressure due to depth within a fluid and hydrostatic pressure is the total pressure at a particular point in a fluid.\nc) Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does.\nd) Hydrostatic pressure is always greater than absolute pressure.\nClick to Reveal the Answer\nC is correct. Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does.\nHydrostatic pressure is the pressure due to depth within a fluid, while absolute pressure is hydrostatic pressure summed with atmospheric pressure. Thus, hydrostatic pressure does not consider atmospheric pressure while absolute pressure does. A is incorrect because hydrostatic and absolute pressures are different terms. B is incorrect because absolute pressure is the total pressure at a particular point in fluid, while hydrostatic pressure is the pressure due to depth within a fluid. This question has the terms flipped. D is incorrect because since absolute pressure is the sum of hydrostatic pressure and atmospheric pressure, absolute pressure will always be greater than hydrostatic pressure.\nHydrostatics with Fluids\nHydrostatics is referring to the study of fluids at rest, as opposed to hydrodynamics, which is the study of fluids in motion. A fluid can either be a liquid or gas, and no definitive shape. In order to discuss hydrostatics, we will first define several terms relating to the characteristics of a fluid, including density, weight, specific gravity, and pressure.\nDensity (ρ) is defined as a measure of how condensed a substance is, which we can understand through the equation mass\/volume. From the equation for density, the units of density are units of mass per volume (kg\/m\n3\n).\nρ = mV\nWeight is synonymous with the force of gravity (F\ng\n). In other contexts, we discuss one way of calculating weight, by multiplying an object’s mass with the gravitational constant. However, by substituting in \nρ\nV for mass in the equation for weight, we find that an alternative expression for weight is the density of an object times its volume. If we know the density of a fluid and we know the volume of a particular fluid, then we are able to calculate the gravitational force acting on that fluid.\nF\ng\n = mg = pVg\nOn the MCAT, specific gravity (SG) is most often defined as a measure of density relative to water. Specifically, it is calculated as the density of some substance of your choosing divided by the density of water. For the MCAT, you will need to have memorized the density of water, which can be written as 1000 kg\/m\n3\n, 1 kg\/L, 1 g\/mL, or 1 g\/cm\n3\n.  If an object is denser than the fluid it is contained in, it will sink. Therefore, we can say that if an object has a specific gravity greater than 1, it will sink. If an object has a specific gravity less than 1, it will be neutrally buoyant. If an object has a specific gravity less than 1, it will float.\nSG = ρ\nsubstance\n\/\nρ\nwater\nPressure is defined as force (N) applied over an area (m2), and therefore has units of N\/m\n2\n. One N\/m\n2\n is equal to one Pascal (Pa). Various types of pressure are relevant when discussing fluids, including hydrostatic pressure and absolute pressure.\nP = F\/A\nHydrostatic Pressure\nHydrostatic pressure, also called gauge pressure, is the pressure that is a result of being at a certain depth within a fluid. Consider a container filled to the brim with fluid. Within the container of fluid, imagine a flat sheet of metal that has a length (\nl\n) and width (\nw\n). This is important because the sheet of metal has a particular area that is going to be acted on by the fluid, creating pressure. Pressure is equal to force\/area, and when the sheet of metal is submerged in water, the force acting on the metal is the weight of the fluid above it. Recall that we defined the weight of the fluid as its density multiplied by its volume. The farther down in the container the sheet is, the greater the weight of water acting on the sheet. The pressure acting on the sheet of metal is the force of gravity over the sheet across the area of the sheet. However, we can derive an even more specific equation. The volume of water above the sheet is equal to the length of the sheet, multiplied by the width of the sheet, multiplied by the depth (h) of the sheet below the water (essentially the height of the column of water above the sheet). The length by width of the sheet is equal to area, which cancels out with area in the denominator. The hydrostatic pressure of a fluid at a particular depth is therefore equal to the product of its density, the gravitational constant, and the depth at which it acts.\nAbsolute Pressure\nHydrostatic pressure does not take into account the total pressure at a particular point in a fluid. The total pressure, or absolute pressure, at a particular point takes into account two things: the hydrostatic pressure at that point, and the atmospheric pressure. The hydrostatic pressure is the pressure due to the weight of water acting across an area, and the atmospheric pressure is the pressure due to the atmosphere pushing down on the surface of the fluid.\nAt the very surface of a fluid, there is no hydrostatic pressure, but there is atmospheric pressure due to the air above the fluid pressing downward. If an MCAT question specifically asks you to calculate the gauge or hydrostatic pressure at a point in a fluid, you would disregard atmospheric pressure. However, it is important to remember that it exists and contributes to absolute pressure.\nPrev\nPrevious\nIsobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics\nExplore More MCAT Masterclass Chapters\nTake a closer look at our entire\nMCAT Masterclass\nor explore our Biochemistry lessons below.\nIsobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics\nStart Lesson »\nFluids – Hydrostatic Pressure – MCAT Physics\nStart Lesson »\nOne-on-One Tutoring\nAre you ready to take your MCAT performance to a whole new level? Work with our 99th-percentile MCAT tutors to boost your score by 12 points or more!\nSee if MCAT Tutoring can help me\nLearn About MCAT Tutoring\nTalk to our enrollment team about MCAT Tutoring\nBook a \n\t\t\t\t                                                                                                 Free\n\t\t\t\t                                                                                                 Consultation\nMCAT Go Audio Course\nEngaging audio learning to take your MCAT learning on the go, any time, any where. You'll be on the way to a higher MCAT score no matter where you are. Listen to over 200+ lessons.\nListen Now\nMCAT Practice Exams\nPractice makes perfect! Our mock exams coupled with thorough explanations and in-depth analytics help students understand exactly where they stand.\nGet Started\nMCAT Prep App\nAccess hundreds of MCAT videos to help you study and raise your exam score. Augment your learning with  expert-created flashcards and a question banks.\nDownload Now","attrs_markdown":"- [*(888) 381-9509*](<tel:(888) 381-9509>)\n- [*enroll@medschoolcoach.com*](mailto:enroll@medschoolcoach.com)\n- [Book a Meeting](https:\/\/www.medschoolcoach.com\/fluids-hydrostatic-pressure-mcat-physics\/)\n\n- [*Contact Us*](https:\/\/www.medschoolcoach.com\/contact-us\/)\n- [*blog*](https:\/\/www.medschoolcoach.com\/blog\/)\n- [*student login*](https:\/\/www.medschoolcoach.com\/student-login\/)\n\n[![MedSchoolCoach - Logo](https:\/\/www.medschoolcoach.com\/wp-content\/uploads\/2020\/06\/medschoolcoach-logo.png)](https:\/\/www.medschoolcoach.com\/)\n\n[Book a Meeting](https:\/\/www.medschoolcoach.com\/fluids-hydrostatic-pressure-mcat-physics\/)\n\n- [Why MSC? Our Difference](https:\/\/www.medschoolcoach.com\/fluids-hydrostatic-pressure-mcat-physics\/ \"Why MSC? Our Difference\")\n  - [Our StoryHow it started](https:\/\/www.medschoolcoach.com\/our-story\/ \"Our StoryHow it started\")\n  - [Our Team Meet Our Advisors & Tutors](https:\/\/www.medschoolcoach.com\/meet-our-team\/ \"Our Team Meet Our Advisors & Tutors\")\n  - [Our Services How we can help you](https:\/\/www.medschoolcoach.com\/our-services\/ \"Our Services How we can help you\")\n  - [Our Difference Learn why we stand out](https:\/\/www.medschoolcoach.com\/advantage\/ \"Our Difference Learn why we stand out\")\n  - [Success Stories & Testimonials  Hear the stories](https:\/\/www.medschoolcoach.com\/success-stories-reviews\/ \"Success Stories & Testimonials  Hear the stories\")\n  - [For Parents Learn why you should trust us](https:\/\/www.medschoolcoach.com\/for-parents\/ \"For Parents Learn why you should trust us\")\n  - [In the News Read Our Stories](https:\/\/www.medschoolcoach.com\/in-the-news\/ \"In the News Read Our Stories\")\n  - [Frequently Asked QuestionsFind answers](https:\/\/www.medschoolcoach.com\/frequently-asked-questions\/ \"Frequently Asked QuestionsFind answers\")\n- [MCAT Tutoring & Prep](https:\/\/www.medschoolcoach.com\/fluids-hydrostatic-pressure-mcat-physics\/ \"MCAT Tutoring & Prep\")\n  - 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[For MCAT PreparationBoost Your Score](https:\/\/www.medschoolcoach.com\/mcat-resources-self-guided-learning\/ \"For MCAT PreparationBoost Your Score\")\n  - [For Med School AdmissionsSecure Your Acceptance](https:\/\/www.medschoolcoach.com\/admissions-resources-self-guided-learning\/ \"For Med School AdmissionsSecure Your Acceptance\")\n  - [For Board Exam PrepSharpen Critical Knowledge](https:\/\/www.medschoolcoach.com\/self-guided-learning-for-board-exams-and-residency\/#board \"For Board Exam PrepSharpen Critical Knowledge\")\n  - [For Residency MatchingSecure Preferred Placement](https:\/\/www.medschoolcoach.com\/self-guided-learning-for-board-exams-and-residency\/#residency \"For Residency MatchingSecure Preferred Placement\")\n  - [WebinarsWatch On-Demand\\!](https:\/\/www.medschoolcoach.com\/webinars\/ \"WebinarsWatch On-Demand!\")\n  - [GuidebooksLearn at Your Own Pace](https:\/\/www.medschoolcoach.com\/guidebooks\/ \"GuidebooksLearn at Your Own Pace\")\n- [CART](https:\/\/www.medschoolcoach.com\/cart\/ \"CART\")\n\n# Fluids - Hydrostatic Pressure\n##### MCAT Physics Topic\n\n1. [Home](https:\/\/www.medschoolcoach.com\/)\n2. »\n3. [MCAT Masterclass](https:\/\/www.medschoolcoach.com\/category\/mcat-masterclass\/)\n4. »\n5. [Chemical and Physical Foundations of Biological Systems](https:\/\/www.medschoolcoach.com\/category\/mcat-masterclass\/chem-phys\/)\n6. »\n7. [Physics](https:\/\/www.medschoolcoach.com\/category\/mcat-masterclass\/chem-phys\/physics\/)\n8. »\n9. Fluids – Hydrostatic Pressure – MCAT Physics\n\n## Sample MCAT Question: Fluids\nHow are hydrostatic and absolute pressure different?\n\na) Hydrostatic pressure and absolute pressure are the same thing.\n\nb) Absolute pressure is the pressure due to depth within a fluid and hydrostatic pressure is the total pressure at a particular point in a fluid.\n\nc) Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does.\n\nd) Hydrostatic pressure is always greater than absolute pressure.\n\n[Click to Reveal the Answer]()\n\nC is correct. Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does.\n\nHydrostatic pressure is the pressure due to depth within a fluid, while absolute pressure is hydrostatic pressure summed with atmospheric pressure. Thus, hydrostatic pressure does not consider atmospheric pressure while absolute pressure does. A is incorrect because hydrostatic and absolute pressures are different terms. B is incorrect because absolute pressure is the total pressure at a particular point in fluid, while hydrostatic pressure is the pressure due to depth within a fluid. This question has the terms flipped. D is incorrect because since absolute pressure is the sum of hydrostatic pressure and atmospheric pressure, absolute pressure will always be greater than hydrostatic pressure.\n## Hydrostatics with Fluids\nHydrostatics is referring to the study of fluids at rest, as opposed to hydrodynamics, which is the study of fluids in motion. A fluid can either be a liquid or gas, and no definitive shape. In order to discuss hydrostatics, we will first define several terms relating to the characteristics of a fluid, including density, weight, specific gravity, and pressure.\n\nDensity (ρ) is defined as a measure of how condensed a substance is, which we can understand through the equation mass\/volume. From the equation for density, the units of density are units of mass per volume (kg\/m3).\n\n**ρ = mV**\n\nWeight is synonymous with the force of gravity (Fg). In other contexts, we discuss one way of calculating weight, by multiplying an object’s mass with the gravitational constant. However, by substituting in ρV for mass in the equation for weight, we find that an alternative expression for weight is the density of an object times its volume. If we know the density of a fluid and we know the volume of a particular fluid, then we are able to calculate the gravitational force acting on that fluid.\n\n**Fg** **\\= mg = pVg**\n\nOn the MCAT, specific gravity (SG) is most often defined as a measure of density relative to water. Specifically, it is calculated as the density of some substance of your choosing divided by the density of water. For the MCAT, you will need to have memorized the density of water, which can be written as 1000 kg\/m3, 1 kg\/L, 1 g\/mL, or 1 g\/cm3. If an object is denser than the fluid it is contained in, it will sink. Therefore, we can say that if an object has a specific gravity greater than 1, it will sink. If an object has a specific gravity less than 1, it will be neutrally buoyant. If an object has a specific gravity less than 1, it will float.\n\n***SG = ρsubstance\/*ρ*water***\n\nPressure is defined as force (N) applied over an area (m2), and therefore has units of N\/m2. One N\/m2 is equal to one Pascal (Pa). Various types of pressure are relevant when discussing fluids, including hydrostatic pressure and absolute pressure.\n\n**P = F\/A**\n## Hydrostatic Pressure\nHydrostatic pressure, also called gauge pressure, is the pressure that is a result of being at a certain depth within a fluid. Consider a container filled to the brim with fluid. Within the container of fluid, imagine a flat sheet of metal that has a length (*l*) and width (*w*). This is important because the sheet of metal has a particular area that is going to be acted on by the fluid, creating pressure. Pressure is equal to force\/area, and when the sheet of metal is submerged in water, the force acting on the metal is the weight of the fluid above it. Recall that we defined the weight of the fluid as its density multiplied by its volume. The farther down in the container the sheet is, the greater the weight of water acting on the sheet. The pressure acting on the sheet of metal is the force of gravity over the sheet across the area of the sheet. However, we can derive an even more specific equation. The volume of water above the sheet is equal to the length of the sheet, multiplied by the width of the sheet, multiplied by the depth (h) of the sheet below the water (essentially the height of the column of water above the sheet). The length by width of the sheet is equal to area, which cancels out with area in the denominator. The hydrostatic pressure of a fluid at a particular depth is therefore equal to the product of its density, the gravitational constant, and the depth at which it acts.\n\n![Fluids Hydrostatic Pressure MCAT Physics](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20525%20116'%3E%3C\/svg%3E)\n\n![Fluids Hydrostatic Pressure MCAT Physics](https:\/\/www.medschoolcoach.com\/wp-content\/uploads\/2021\/12\/fluids-hydrostatic-pressure-8211-mcat-physics.png)\n## Absolute Pressure\nHydrostatic pressure does not take into account the total pressure at a particular point in a fluid. The total pressure, or absolute pressure, at a particular point takes into account two things: the hydrostatic pressure at that point, and the atmospheric pressure. The hydrostatic pressure is the pressure due to the weight of water acting across an area, and the atmospheric pressure is the pressure due to the atmosphere pushing down on the surface of the fluid.\n\nAt the very surface of a fluid, there is no hydrostatic pressure, but there is atmospheric pressure due to the air above the fluid pressing downward. If an MCAT question specifically asks you to calculate the gauge or hydrostatic pressure at a point in a fluid, you would disregard atmospheric pressure. However, it is important to remember that it exists and contributes to absolute pressure.\n\n[PrevPreviousIsobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics](https:\/\/www.medschoolcoach.com\/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics\/)\n\n## **Explore More MCAT Masterclass Chapters**\nTake a closer look at our entire [MCAT Masterclass](https:\/\/www.medschoolcoach.com\/masterclass) or explore our Biochemistry lessons below.\n\n### [Isobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics](https:\/\/www.medschoolcoach.com\/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics\/)\n[Start Lesson »](https:\/\/www.medschoolcoach.com\/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics\/)\n\n### [Fluids – Hydrostatic Pressure – MCAT Physics](https:\/\/www.medschoolcoach.com\/fluids-hydrostatic-pressure-mcat-physics\/)\n[Start Lesson »](https:\/\/www.medschoolcoach.com\/fluids-hydrostatic-pressure-mcat-physics\/)\n\n- [Explore More Physics Lessons]()\n  - [‣   Fluids – Hydrostatic Pressure – MCAT Physics](https:\/\/www.medschoolcoach.com\/fluids-hydrostatic-pressure-mcat-physics\/)\n  - [‣  Isobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics](https:\/\/www.medschoolcoach.com\/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics\/)\n\n[![Interview - Job interview](data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20360%20189'%3E%3C\/svg%3E)![Interview - Job interview](https:\/\/www.medschoolcoach.com\/wp-content\/uploads\/2022\/03\/feature-img3.jpg)](https:\/\/www.medschoolcoach.com\/mcat-tutoring\/)\n\n### [One-on-One Tutoring](https:\/\/www.medschoolcoach.com\/mcat-tutoring\/)\nAre you ready to take your MCAT performance to a whole new level? 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[Home](https:\/\/www.medschoolcoach.com\/)\n2. »\n3. [MCAT Masterclass](https:\/\/www.medschoolcoach.com\/category\/mcat-masterclass\/)\n4. »\n5. [Chemical and Physical Foundations of Biological Systems](https:\/\/www.medschoolcoach.com\/category\/mcat-masterclass\/chem-phys\/)\n6. »\n7. [Physics](https:\/\/www.medschoolcoach.com\/category\/mcat-masterclass\/chem-phys\/physics\/)\n8. »\n9. Fluids – Hydrostatic Pressure – MCAT Physics\n\nSample MCAT Question: Fluids\n\nHow are hydrostatic and absolute pressure different?\n\na) Hydrostatic pressure and absolute pressure are the same thing.\n\nb) Absolute pressure is the pressure due to depth within a fluid and hydrostatic pressure is the total pressure at a particular point in a fluid.\n\nc) Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does.\n\nd) Hydrostatic pressure is always greater than absolute pressure.\n\n[Click to Reveal the Answer]()\n\nC is correct. Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does.\n\nHydrostatic pressure is the pressure due to depth within a fluid, while absolute pressure is hydrostatic pressure summed with atmospheric pressure. Thus, hydrostatic pressure does not consider atmospheric pressure while absolute pressure does. A is incorrect because hydrostatic and absolute pressures are different terms. B is incorrect because absolute pressure is the total pressure at a particular point in fluid, while hydrostatic pressure is the pressure due to depth within a fluid. This question has the terms flipped. D is incorrect because since absolute pressure is the sum of hydrostatic pressure and atmospheric pressure, absolute pressure will always be greater than hydrostatic pressure.\n\nHydrostatics with Fluids\n\nHydrostatics is referring to the study of fluids at rest, as opposed to hydrodynamics, which is the study of fluids in motion. A fluid can either be a liquid or gas, and no definitive shape. In order to discuss hydrostatics, we will first define several terms relating to the characteristics of a fluid, including density, weight, specific gravity, and pressure.\n\nDensity (ρ) is defined as a measure of how condensed a substance is, which we can understand through the equation mass\/volume. From the equation for density, the units of density are units of mass per volume (kg\/m3).\n\n**ρ = mV**\n\nWeight is synonymous with the force of gravity (Fg). In other contexts, we discuss one way of calculating weight, by multiplying an object’s mass with the gravitational constant. However, by substituting in ρV for mass in the equation for weight, we find that an alternative expression for weight is the density of an object times its volume. If we know the density of a fluid and we know the volume of a particular fluid, then we are able to calculate the gravitational force acting on that fluid.\n\n**Fg** **\\= mg = pVg**\n\nOn the MCAT, specific gravity (SG) is most often defined as a measure of density relative to water. Specifically, it is calculated as the density of some substance of your choosing divided by the density of water. For the MCAT, you will need to have memorized the density of water, which can be written as 1000 kg\/m3, 1 kg\/L, 1 g\/mL, or 1 g\/cm3. If an object is denser than the fluid it is contained in, it will sink. Therefore, we can say that if an object has a specific gravity greater than 1, it will sink. If an object has a specific gravity less than 1, it will be neutrally buoyant. If an object has a specific gravity less than 1, it will float.\n\n***SG = ρsubstance\/*ρ*water***\n\nPressure is defined as force (N) applied over an area (m2), and therefore has units of N\/m2. One N\/m2 is equal to one Pascal (Pa). Various types of pressure are relevant when discussing fluids, including hydrostatic pressure and absolute pressure.\n\n**P = F\/A**\n\nHydrostatic Pressure\n\nHydrostatic pressure, also called gauge pressure, is the pressure that is a result of being at a certain depth within a fluid. Consider a container filled to the brim with fluid. Within the container of fluid, imagine a flat sheet of metal that has a length (*l*) and width (*w*). This is important because the sheet of metal has a particular area that is going to be acted on by the fluid, creating pressure. Pressure is equal to force\/area, and when the sheet of metal is submerged in water, the force acting on the metal is the weight of the fluid above it. Recall that we defined the weight of the fluid as its density multiplied by its volume. The farther down in the container the sheet is, the greater the weight of water acting on the sheet. The pressure acting on the sheet of metal is the force of gravity over the sheet across the area of the sheet. However, we can derive an even more specific equation. The volume of water above the sheet is equal to the length of the sheet, multiplied by the width of the sheet, multiplied by the depth (h) of the sheet below the water (essentially the height of the column of water above the sheet). The length by width of the sheet is equal to area, which cancels out with area in the denominator. The hydrostatic pressure of a fluid at a particular depth is therefore equal to the product of its density, the gravitational constant, and the depth at which it acts.\n\n![Fluids Hydrostatic Pressure MCAT Physics](https:\/\/www.medschoolcoach.com\/wp-content\/uploads\/2021\/12\/fluids-hydrostatic-pressure-8211-mcat-physics.png)\n\nAbsolute Pressure\n\nHydrostatic pressure does not take into account the total pressure at a particular point in a fluid. The total pressure, or absolute pressure, at a particular point takes into account two things: the hydrostatic pressure at that point, and the atmospheric pressure. The hydrostatic pressure is the pressure due to the weight of water acting across an area, and the atmospheric pressure is the pressure due to the atmosphere pushing down on the surface of the fluid.\n\nAt the very surface of a fluid, there is no hydrostatic pressure, but there is atmospheric pressure due to the air above the fluid pressing downward. If an MCAT question specifically asks you to calculate the gauge or hydrostatic pressure at a point in a fluid, you would disregard atmospheric pressure. However, it is important to remember that it exists and contributes to absolute pressure.\n\n[PrevPreviousIsobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics](https:\/\/www.medschoolcoach.com\/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics\/)\n\n## **Explore More MCAT Masterclass Chapters**\nTake a closer look at our entire [MCAT Masterclass](https:\/\/www.medschoolcoach.com\/masterclass) or explore our Biochemistry lessons below.\n\n### [Isobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics](https:\/\/www.medschoolcoach.com\/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics\/)\n[Start Lesson »](https:\/\/www.medschoolcoach.com\/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics\/)\n\n### [Fluids – Hydrostatic Pressure – MCAT Physics](https:\/\/www.medschoolcoach.com\/fluids-hydrostatic-pressure-mcat-physics\/)\n[Start Lesson »](https:\/\/www.medschoolcoach.com\/fluids-hydrostatic-pressure-mcat-physics\/)\n\n[![Interview - Job interview](https:\/\/www.medschoolcoach.com\/wp-content\/uploads\/2022\/03\/feature-img3.jpg)](https:\/\/www.medschoolcoach.com\/mcat-tutoring\/)\n\n### [One-on-One Tutoring](https:\/\/www.medschoolcoach.com\/mcat-tutoring\/)\nAre you ready to take your MCAT performance to a whole new level? Work with our 99th-percentile MCAT tutors to boost your score by 12 points or more\\!\n\n**See if MCAT Tutoring can help me**\n\n[Learn About MCAT Tutoring](https:\/\/www.medschoolcoach.com\/mcat-tutoring)\n\n**Talk to our enrollment team about MCAT Tutoring**\n\nBook a Free Consultation\n\n[![Medical College Admission Test - MCAT Physics](https:\/\/www.medschoolcoach.com\/wp-content\/uploads\/2022\/02\/mcat-go-mini-image.jpg)](https:\/\/www.medschoolcoach.com\/mcat-go\/)\n\n### [MCAT Go Audio Course](https:\/\/www.medschoolcoach.com\/mcat-go\/)\nEngaging audio learning to take your MCAT learning on the go, any time, any where. You'll be on the way to a higher MCAT score no matter where you are. 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Boilerpipe Text	MCAT Physics Topic Home » MCAT Masterclass » Chemical and Physical Foundations of Biological Systems » Physics » Fluids – Hydrostatic Pressure – MCAT Physics Sample MCAT Question: Fluids How are hydrostatic and absolute pressure different? a) Hydrostatic pressure and absolute pressure are the same thing. b) Absolute pressure is the pressure due to depth within a fluid and hydrostatic pressure is the total pressure at a particular point in a fluid. c) Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does. d) Hydrostatic pressure is always greater than absolute pressure. Click to Reveal the Answer C is correct. Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does. Hydrostatic pressure is the pressure due to depth within a fluid, while absolute pressure is hydrostatic pressure summed with atmospheric pressure. Thus, hydrostatic pressure does not consider atmospheric pressure while absolute pressure does. A is incorrect because hydrostatic and absolute pressures are different terms. B is incorrect because absolute pressure is the total pressure at a particular point in fluid, while hydrostatic pressure is the pressure due to depth within a fluid. This question has the terms flipped. D is incorrect because since absolute pressure is the sum of hydrostatic pressure and atmospheric pressure, absolute pressure will always be greater than hydrostatic pressure. Hydrostatics with Fluids Hydrostatics is referring to the study of fluids at rest, as opposed to hydrodynamics, which is the study of fluids in motion. A fluid can either be a liquid or gas, and no definitive shape. In order to discuss hydrostatics, we will first define several terms relating to the characteristics of a fluid, including density, weight, specific gravity, and pressure. Density (ρ) is defined as a measure of how condensed a substance is, which we can understand through the equation mass/volume. From the equation for density, the units of density are units of mass per volume (kg/m 3 ). ρ = mV Weight is synonymous with the force of gravity (F g ). In other contexts, we discuss one way of calculating weight, by multiplying an object’s mass with the gravitational constant. However, by substituting in ρ V for mass in the equation for weight, we find that an alternative expression for weight is the density of an object times its volume. If we know the density of a fluid and we know the volume of a particular fluid, then we are able to calculate the gravitational force acting on that fluid. F g = mg = pVg On the MCAT, specific gravity (SG) is most often defined as a measure of density relative to water. Specifically, it is calculated as the density of some substance of your choosing divided by the density of water. For the MCAT, you will need to have memorized the density of water, which can be written as 1000 kg/m 3 , 1 kg/L, 1 g/mL, or 1 g/cm 3 . If an object is denser than the fluid it is contained in, it will sink. Therefore, we can say that if an object has a specific gravity greater than 1, it will sink. If an object has a specific gravity less than 1, it will be neutrally buoyant. If an object has a specific gravity less than 1, it will float. SG = ρ substance / ρ water Pressure is defined as force (N) applied over an area (m2), and therefore has units of N/m 2 . One N/m 2 is equal to one Pascal (Pa). Various types of pressure are relevant when discussing fluids, including hydrostatic pressure and absolute pressure. P = F/A Hydrostatic Pressure Hydrostatic pressure, also called gauge pressure, is the pressure that is a result of being at a certain depth within a fluid. Consider a container filled to the brim with fluid. Within the container of fluid, imagine a flat sheet of metal that has a length ( l ) and width ( w ). This is important because the sheet of metal has a particular area that is going to be acted on by the fluid, creating pressure. Pressure is equal to force/area, and when the sheet of metal is submerged in water, the force acting on the metal is the weight of the fluid above it. Recall that we defined the weight of the fluid as its density multiplied by its volume. The farther down in the container the sheet is, the greater the weight of water acting on the sheet. The pressure acting on the sheet of metal is the force of gravity over the sheet across the area of the sheet. However, we can derive an even more specific equation. The volume of water above the sheet is equal to the length of the sheet, multiplied by the width of the sheet, multiplied by the depth (h) of the sheet below the water (essentially the height of the column of water above the sheet). The length by width of the sheet is equal to area, which cancels out with area in the denominator. The hydrostatic pressure of a fluid at a particular depth is therefore equal to the product of its density, the gravitational constant, and the depth at which it acts. Absolute Pressure Hydrostatic pressure does not take into account the total pressure at a particular point in a fluid. The total pressure, or absolute pressure, at a particular point takes into account two things: the hydrostatic pressure at that point, and the atmospheric pressure. The hydrostatic pressure is the pressure due to the weight of water acting across an area, and the atmospheric pressure is the pressure due to the atmosphere pushing down on the surface of the fluid. At the very surface of a fluid, there is no hydrostatic pressure, but there is atmospheric pressure due to the air above the fluid pressing downward. If an MCAT question specifically asks you to calculate the gauge or hydrostatic pressure at a point in a fluid, you would disregard atmospheric pressure. However, it is important to remember that it exists and contributes to absolute pressure. Prev Previous Isobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics Explore More MCAT Masterclass Chapters Take a closer look at our entire MCAT Masterclass or explore our Biochemistry lessons below. Isobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics Start Lesson » Fluids – Hydrostatic Pressure – MCAT Physics Start Lesson » One-on-One Tutoring Are you ready to take your MCAT performance to a whole new level? Work with our 99th-percentile MCAT tutors to boost your score by 12 points or more! 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[Home](https://www.medschoolcoach.com/) 2. » 3. [MCAT Masterclass](https://www.medschoolcoach.com/category/mcat-masterclass/) 4. » 5. [Chemical and Physical Foundations of Biological Systems](https://www.medschoolcoach.com/category/mcat-masterclass/chem-phys/) 6. » 7. [Physics](https://www.medschoolcoach.com/category/mcat-masterclass/chem-phys/physics/) 8. » 9. Fluids – Hydrostatic Pressure – MCAT Physics ## Sample MCAT Question: Fluids How are hydrostatic and absolute pressure different? a) Hydrostatic pressure and absolute pressure are the same thing. b) Absolute pressure is the pressure due to depth within a fluid and hydrostatic pressure is the total pressure at a particular point in a fluid. c) Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does. d) Hydrostatic pressure is always greater than absolute pressure. [Click to Reveal the Answer]() C is correct. Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does. Hydrostatic pressure is the pressure due to depth within a fluid, while absolute pressure is hydrostatic pressure summed with atmospheric pressure. Thus, hydrostatic pressure does not consider atmospheric pressure while absolute pressure does. A is incorrect because hydrostatic and absolute pressures are different terms. B is incorrect because absolute pressure is the total pressure at a particular point in fluid, while hydrostatic pressure is the pressure due to depth within a fluid. This question has the terms flipped. D is incorrect because since absolute pressure is the sum of hydrostatic pressure and atmospheric pressure, absolute pressure will always be greater than hydrostatic pressure. ## Hydrostatics with Fluids Hydrostatics is referring to the study of fluids at rest, as opposed to hydrodynamics, which is the study of fluids in motion. A fluid can either be a liquid or gas, and no definitive shape. In order to discuss hydrostatics, we will first define several terms relating to the characteristics of a fluid, including density, weight, specific gravity, and pressure. Density (ρ) is defined as a measure of how condensed a substance is, which we can understand through the equation mass/volume. From the equation for density, the units of density are units of mass per volume (kg/m3). ρ = mV Weight is synonymous with the force of gravity (Fg). In other contexts, we discuss one way of calculating weight, by multiplying an object’s mass with the gravitational constant. However, by substituting in ρV for mass in the equation for weight, we find that an alternative expression for weight is the density of an object times its volume. If we know the density of a fluid and we know the volume of a particular fluid, then we are able to calculate the gravitational force acting on that fluid. Fg \= mg = pVg On the MCAT, specific gravity (SG) is most often defined as a measure of density relative to water. Specifically, it is calculated as the density of some substance of your choosing divided by the density of water. For the MCAT, you will need to have memorized the density of water, which can be written as 1000 kg/m3, 1 kg/L, 1 g/mL, or 1 g/cm3. If an object is denser than the fluid it is contained in, it will sink. Therefore, we can say that if an object has a specific gravity greater than 1, it will sink. If an object has a specific gravity less than 1, it will be neutrally buoyant. If an object has a specific gravity less than 1, it will float. **SG = ρsubstance/ρwater Pressure is defined as force (N) applied over an area (m2), and therefore has units of N/m2. One N/m2 is equal to one Pascal (Pa). Various types of pressure are relevant when discussing fluids, including hydrostatic pressure and absolute pressure. P = F/A** ## Hydrostatic Pressure Hydrostatic pressure, also called gauge pressure, is the pressure that is a result of being at a certain depth within a fluid. Consider a container filled to the brim with fluid. Within the container of fluid, imagine a flat sheet of metal that has a length (l) and width (w). This is important because the sheet of metal has a particular area that is going to be acted on by the fluid, creating pressure. Pressure is equal to force/area, and when the sheet of metal is submerged in water, the force acting on the metal is the weight of the fluid above it. Recall that we defined the weight of the fluid as its density multiplied by its volume. The farther down in the container the sheet is, the greater the weight of water acting on the sheet. The pressure acting on the sheet of metal is the force of gravity over the sheet across the area of the sheet. However, we can derive an even more specific equation. The volume of water above the sheet is equal to the length of the sheet, multiplied by the width of the sheet, multiplied by the depth (h) of the sheet below the water (essentially the height of the column of water above the sheet). The length by width of the sheet is equal to area, which cancels out with area in the denominator. The hydrostatic pressure of a fluid at a particular depth is therefore equal to the product of its density, the gravitational constant, and the depth at which it acts. ![Fluids Hydrostatic Pressure MCAT Physics](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20525%20116'%3E%3C/svg%3E) ![Fluids Hydrostatic Pressure MCAT Physics](https://www.medschoolcoach.com/wp-content/uploads/2021/12/fluids-hydrostatic-pressure-8211-mcat-physics.png) ## Absolute Pressure Hydrostatic pressure does not take into account the total pressure at a particular point in a fluid. The total pressure, or absolute pressure, at a particular point takes into account two things: the hydrostatic pressure at that point, and the atmospheric pressure. The hydrostatic pressure is the pressure due to the weight of water acting across an area, and the atmospheric pressure is the pressure due to the atmosphere pushing down on the surface of the fluid. At the very surface of a fluid, there is no hydrostatic pressure, but there is atmospheric pressure due to the air above the fluid pressing downward. If an MCAT question specifically asks you to calculate the gauge or hydrostatic pressure at a point in a fluid, you would disregard atmospheric pressure. However, it is important to remember that it exists and contributes to absolute pressure. [PrevPreviousIsobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics](https://www.medschoolcoach.com/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics/) ## Explore More MCAT Masterclass Chapters Take a closer look at our entire [MCAT Masterclass](https://www.medschoolcoach.com/masterclass) or explore our Biochemistry lessons below. ### [Isobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics](https://www.medschoolcoach.com/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics/) [Start Lesson »](https://www.medschoolcoach.com/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics/) ### [Fluids – Hydrostatic Pressure – MCAT Physics](https://www.medschoolcoach.com/fluids-hydrostatic-pressure-mcat-physics/) [Start Lesson »](https://www.medschoolcoach.com/fluids-hydrostatic-pressure-mcat-physics/) - [Explore More Physics Lessons]() - [‣ Fluids – Hydrostatic Pressure – MCAT Physics](https://www.medschoolcoach.com/fluids-hydrostatic-pressure-mcat-physics/) - [‣ Isobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics](https://www.medschoolcoach.com/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics/) [![Interview - Job interview](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20360%20189'%3E%3C/svg%3E)![Interview - Job interview](https://www.medschoolcoach.com/wp-content/uploads/2022/03/feature-img3.jpg)](https://www.medschoolcoach.com/mcat-tutoring/) ### [One-on-One Tutoring](https://www.medschoolcoach.com/mcat-tutoring/) Are you ready to take your MCAT performance to a whole new level? 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Readable Markdown	MCAT Physics Topic 1. [Home](https://www.medschoolcoach.com/) 2. » 3. [MCAT Masterclass](https://www.medschoolcoach.com/category/mcat-masterclass/) 4. » 5. [Chemical and Physical Foundations of Biological Systems](https://www.medschoolcoach.com/category/mcat-masterclass/chem-phys/) 6. » 7. [Physics](https://www.medschoolcoach.com/category/mcat-masterclass/chem-phys/physics/) 8. » 9. Fluids – Hydrostatic Pressure – MCAT Physics Sample MCAT Question: Fluids How are hydrostatic and absolute pressure different? a) Hydrostatic pressure and absolute pressure are the same thing. b) Absolute pressure is the pressure due to depth within a fluid and hydrostatic pressure is the total pressure at a particular point in a fluid. c) Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does. d) Hydrostatic pressure is always greater than absolute pressure. [Click to Reveal the Answer]() C is correct. Hydrostatic pressure does not consider atmospheric pressure, while absolute pressure does. Hydrostatic pressure is the pressure due to depth within a fluid, while absolute pressure is hydrostatic pressure summed with atmospheric pressure. Thus, hydrostatic pressure does not consider atmospheric pressure while absolute pressure does. A is incorrect because hydrostatic and absolute pressures are different terms. B is incorrect because absolute pressure is the total pressure at a particular point in fluid, while hydrostatic pressure is the pressure due to depth within a fluid. This question has the terms flipped. D is incorrect because since absolute pressure is the sum of hydrostatic pressure and atmospheric pressure, absolute pressure will always be greater than hydrostatic pressure. Hydrostatics with Fluids Hydrostatics is referring to the study of fluids at rest, as opposed to hydrodynamics, which is the study of fluids in motion. A fluid can either be a liquid or gas, and no definitive shape. In order to discuss hydrostatics, we will first define several terms relating to the characteristics of a fluid, including density, weight, specific gravity, and pressure. Density (ρ) is defined as a measure of how condensed a substance is, which we can understand through the equation mass/volume. From the equation for density, the units of density are units of mass per volume (kg/m3). ρ = mV Weight is synonymous with the force of gravity (Fg). In other contexts, we discuss one way of calculating weight, by multiplying an object’s mass with the gravitational constant. However, by substituting in ρV for mass in the equation for weight, we find that an alternative expression for weight is the density of an object times its volume. If we know the density of a fluid and we know the volume of a particular fluid, then we are able to calculate the gravitational force acting on that fluid. Fg \= mg = pVg On the MCAT, specific gravity (SG) is most often defined as a measure of density relative to water. Specifically, it is calculated as the density of some substance of your choosing divided by the density of water. For the MCAT, you will need to have memorized the density of water, which can be written as 1000 kg/m3, 1 kg/L, 1 g/mL, or 1 g/cm3. If an object is denser than the fluid it is contained in, it will sink. Therefore, we can say that if an object has a specific gravity greater than 1, it will sink. If an object has a specific gravity less than 1, it will be neutrally buoyant. If an object has a specific gravity less than 1, it will float. **SG = ρsubstance/ρwater Pressure is defined as force (N) applied over an area (m2), and therefore has units of N/m2. One N/m2 is equal to one Pascal (Pa). Various types of pressure are relevant when discussing fluids, including hydrostatic pressure and absolute pressure. P = F/A** Hydrostatic Pressure Hydrostatic pressure, also called gauge pressure, is the pressure that is a result of being at a certain depth within a fluid. Consider a container filled to the brim with fluid. Within the container of fluid, imagine a flat sheet of metal that has a length (l) and width (w). This is important because the sheet of metal has a particular area that is going to be acted on by the fluid, creating pressure. Pressure is equal to force/area, and when the sheet of metal is submerged in water, the force acting on the metal is the weight of the fluid above it. Recall that we defined the weight of the fluid as its density multiplied by its volume. The farther down in the container the sheet is, the greater the weight of water acting on the sheet. The pressure acting on the sheet of metal is the force of gravity over the sheet across the area of the sheet. However, we can derive an even more specific equation. The volume of water above the sheet is equal to the length of the sheet, multiplied by the width of the sheet, multiplied by the depth (h) of the sheet below the water (essentially the height of the column of water above the sheet). The length by width of the sheet is equal to area, which cancels out with area in the denominator. The hydrostatic pressure of a fluid at a particular depth is therefore equal to the product of its density, the gravitational constant, and the depth at which it acts. ![Fluids Hydrostatic Pressure MCAT Physics](https://www.medschoolcoach.com/wp-content/uploads/2021/12/fluids-hydrostatic-pressure-8211-mcat-physics.png) Absolute Pressure Hydrostatic pressure does not take into account the total pressure at a particular point in a fluid. The total pressure, or absolute pressure, at a particular point takes into account two things: the hydrostatic pressure at that point, and the atmospheric pressure. The hydrostatic pressure is the pressure due to the weight of water acting across an area, and the atmospheric pressure is the pressure due to the atmosphere pushing down on the surface of the fluid. At the very surface of a fluid, there is no hydrostatic pressure, but there is atmospheric pressure due to the air above the fluid pressing downward. If an MCAT question specifically asks you to calculate the gauge or hydrostatic pressure at a point in a fluid, you would disregard atmospheric pressure. However, it is important to remember that it exists and contributes to absolute pressure. [PrevPreviousIsobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics](https://www.medschoolcoach.com/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics/) ## Explore More MCAT Masterclass Chapters Take a closer look at our entire [MCAT Masterclass](https://www.medschoolcoach.com/masterclass) or explore our Biochemistry lessons below. ### [Isobaric, Isochoric, Isothermal, and Adiabatic Processes – MCAT Physics](https://www.medschoolcoach.com/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics/) [Start Lesson »](https://www.medschoolcoach.com/isobaric-isochoric-isothermal-and-adiabatic-processes-mcat-physics/) ### [Fluids – Hydrostatic Pressure – MCAT Physics](https://www.medschoolcoach.com/fluids-hydrostatic-pressure-mcat-physics/) [Start Lesson »](https://www.medschoolcoach.com/fluids-hydrostatic-pressure-mcat-physics/) [![Interview - Job interview](https://www.medschoolcoach.com/wp-content/uploads/2022/03/feature-img3.jpg)](https://www.medschoolcoach.com/mcat-tutoring/) ### [One-on-One Tutoring](https://www.medschoolcoach.com/mcat-tutoring/) Are you ready to take your MCAT performance to a whole new level? 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