🎯 Common Question Types:
- Explain gas pressure using the particle model (3-4 marks)
- Describe what happens to pressure when temperature increases (2 marks)
- State and explain what absolute zero is (2 marks) — Edexcel and Eduqas only
- Convert temperatures between Celsius and Kelvin (1 mark) — Edexcel and Eduqas only
- Higher: Boyle's law calculations with p₁V₁ = p₂V₂ (3 marks) — given on every board's equation sheet; Eduqas alone also tests p₁/T₁ = p₂/T₂
📝 Key Command Words:
- Explain (particle model): Must include speed, frequency, and force of collisions
- Describe: State the change in pressure and reason
- Calculate: Show full working; Boyle's law questions need no Kelvin conversion on any board — only Eduqas pressure-law questions do
- State: Give the value or definition (e.g. gas pressure = force per unit area on the container walls)
⚠️ Common Mistakes to Avoid:
- Using Celsius instead of Kelvin in gas law calculations (Eduqas only — no other board sets one)
- Saying particles get bigger when heated — they don't
- Only mentioning frequency OR force of collisions — mention both
- Confusing pressure with force — pressure = force per unit area
Quick Check: What is absolute zero in degrees Celsius, and what does it represent in terms of particle motion?
Absolute zero = −273°C (= 0 K). At this temperature, particles have the minimum possible kinetic energy. Gas pressure would theoretically be zero because particles would not be colliding with container walls.
This exam tips covers Exam Tips for Gas Pressure and Temperature within Gas Pressure & Temperature for GCSE Physics. Revise Gas Pressure & Temperature in Particle Model for GCSE Physics with 29 exam-style questions and 30 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 10 of 11 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for Gas Pressure & Temperature
A sealed gas container is heated. What happens to the pressure of the gas inside?
A sealed gas cylinder is heated. Explain, using particle theory, why the pressure of the gas increases when the temperature increases.