Celsius to Kelvin (Edexcel and Eduqas only): Add 273. Remember with: "Kelvin is Celsius + 273 — K is above 0, C starts at −273." Or simply: K = C + 273.
Gas pressure particle explanation — the 3-step answer:
- Particles move faster (higher kinetic energy)
- More frequent collisions with walls
- Greater force per collision → higher pressure
Absolute zero: −273°C. Think "−273 is the floor — you can't go lower." Like the lowest floor of a building. Everything above is a positive Kelvin value.
This memory aid covers Memory Aid 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 7 of 11 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
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.