# A sealed metal container holds a fixed amount of gas. The container is placed in hot water and the temperature of the gas increases. Explain why the pressure of the gas inside the container increases.

> Eduqas GCSE Physics — 2.3 Forces and motion · Explain · 4 marks

## Mark scheme (4 marks)

1. Increasing temperature increases the kinetic energy (and/or speed/velocity) of the gas particles
2. The faster-moving particles collide with the walls of the container more frequently
3. Each collision exerts a greater (perpendicular) force on the walls because the particles are moving faster
4. Greater force per unit area on the walls means pressure increases (and volume is constant so pressure must rise)

## Key terms

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

## Related

- [Revision notes for Eduqas GCSE 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/a-sealed-metal-container-holds-a-e3a38ae0) · Published by Druglandscape Ltd.