Pressure in Fluids — GCSE Physics Revision
Revise Pressure in Fluids for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Work Done & SpringsWhat is Pressure in Fluids?
Pressure in a fluid (a liquid or a gas) is caused by the collisions of the fluid particles with a surface. The pressure acts in all directions and increases with depth. This is because the weight of the fluid above exerts a force on the fluid below. The pressure in a liquid can be calculated using the formula P = hρg, where h is the depth, ρ is the density of the fluid, and g is the gravitational field strength.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The pressure formula P = hρg is usually for Higher Tier only.
Step-by-step explanationWorked example
Calculate the pressure at the bottom of a swimming pool that is 3m deep. The density of water is 1000 kg/m³ and g = 9.8 N/kg. Solution: Pressure = hρg = 3m x 1000 kg/m³ x 9.8 N/kg = 29,400 Pa.
Mini lesson for Pressure in Fluids
1. Understand the core idea
Pressure in a fluid (a liquid or a gas) is caused by the collisions of the fluid particles with a surface. The pressure acts in all directions and increases with depth.
Can you explain Pressure in Fluids without copying the notes?
2. Turn it into marks
Calculate the pressure at the bottom of a swimming pool that is 3m deep. The density of water is 1000 kg/m³ and g = 9.
Underline the method, evidence, or command-word move that would earn credit in GCSE Forces.
3. Fix the likely mark leak
Watch for this mistake: Forgetting that pressure acts in all directions within a fluid, not just downwards.
Write one correction rule before doing another practice question.
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Jump into adaptive, exam-style questions for Pressure in Fluids. Free to start; sign in to save progress.
Pressure in Fluids practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what Pressure in Fluids is testing.
Answer: Pressure in a fluid (a liquid or a gas) is caused by the collisions of the fluid particles with a surface. The pressure acts in all directions and increases with depth.
Mark focus: Precise definition and topic focus.
Question 2
A Pressure in Fluids question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Forgetting that pressure acts in all directions within a fluid, not just downwards." What should their next repair task be?
Answer: Do one Pressure in Fluids question and review the mistake type.
Mark focus: Error correction and next-step practice.
Pressure in Fluids flashcards
Core idea
What is the main idea in Pressure in Fluids?
Pressure in a fluid (a liquid or a gas) is caused by the collisions of the fluid particles with a surface. The pressure acts in all directions and increases with depth.
Common mistake
What mistake should you avoid in Pressure in Fluids?
Forgetting that pressure acts in all directions within a fluid, not just downwards.
Practice
What is one useful practice task for Pressure in Fluids?
Answer one Pressure in Fluids question and review the mistake type.
Exam board
How should you use board notes for Pressure in Fluids?
Covered by all major boards (AQA, Edexcel, OCR). The pressure formula P = hρg is usually for Higher Tier only.
Common mistakes
- 1Forgetting that pressure acts in all directions within a fluid, not just downwards.
- 2Thinking that the pressure depends on the shape of the container. The pressure at a certain depth only depends on the depth, density, and g.
- 3Using the wrong units in the pressure calculation. Depth must be in metres, density in kg/m³, and g in N/kg to get pressure in Pascals (Pa).
Pressure in Fluids exam questions
Exam-style questions for Pressure in Fluids with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Pressure in Fluids
Core concept
Pressure in a fluid (a liquid or a gas) is caused by the collisions of the fluid particles with a surface. The pressure acts in all directions and increases with depth. This is because the weight of t…
Frequently asked questions
Why do your ears pop when you go up in a plane?
As the plane climbs, the atmospheric pressure outside decreases. The air trapped in your middle ear is at a higher pressure, which pushes on your eardrum. The 'pop' is the sound of the pressure equalising as air escapes through your Eustachian tube.
What is upthrust?
Upthrust is the upward force that a fluid exerts on an object submerged in it. It is caused by the pressure of the fluid being greater at the bottom of the object than at the top. If the upthrust is equal to the object's weight, the object will float.