Particle ModelTopic Summary
Topic Summary: Gas Pressure and Temperature
Part of Gas Pressure & Temperature — GCSE Physics
This topic summary covers Topic Summary: Gas Pressure and Temperature within Gas Pressure & Temperature for GCSE Physics. Revise Gas Pressure & Temperature in Particle Model for GCSE Physics with 13 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 12 of 12 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 12 of 12
Practice
13 questions
Recall
30 flashcards
Topic Summary: Gas Pressure and Temperature
Key Terms
- Gas pressure: force per area from particle-wall collisions
- Absolute zero: 0 K = −273°C, minimum kinetic energy
- Kelvin: absolute temperature scale, T(K) = T(°C) + 273
- Upthrust: upward fluid force = weight of fluid displaced
Key Facts
- Pressure caused by particle-wall collisions
- Higher T → faster particles → more frequent + harder collisions → higher pressure
- Pressure ∝ absolute temperature (Kelvin) at constant volume
- Pressure in liquids increases with depth: P = ρgh
Key Equations
- p = F/A (Pa = N/m²)
- T(K) = T(°C) + 273
- p₁/T₁ = p₂/T₂ (constant volume)
- p₁V₁ = p₂V₂ (constant temperature)
- P = ρgh (pressure in liquid)
Exam Tips
- Particle explanation: speed + frequency + force of collisions
- ALWAYS convert to Kelvin for calculations
- Absolute zero: particles at minimum KE, p = 0 theoretically
- Don't confuse pressure increase with particles getting bigger