# Explain, in terms of particles, what happens to the pressure of a fixed quantity of gas inside a sealed container when the temperature of the gas is increased at constant volume.

> Eduqas A-Level Physics — 2.3 Capacitance (A-Level only) · Explain · 5 marks

## Mark scheme (5 marks)

1. Increasing temperature increases the average kinetic energy (or speed) of the gas particles
2. Faster-moving particles collide with the container walls more frequently
3. Each collision exerts a greater force on the walls (because particles hit harder / with greater momentum)
4. The volume is constant, so the same area of wall receives more / harder collisions
5. Therefore the pressure of the gas increases (pressure is directly proportional to absolute temperature at constant volume)

## Key terms

- [pressure](https://www.gradenine.co.uk/glossary/pressure)
- [temperature](https://www.gradenine.co.uk/glossary/temperature)
- [particles](https://www.gradenine.co.uk/glossary/particles)
- [volume](https://www.gradenine.co.uk/glossary/volume)

## Related

- [Revision notes for Eduqas A-Level Physics](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/explain-in-terms-of-particles-what-bc9f350e) · Published by Druglandscape Ltd.