# A bicycle tyre is pumped up and left in a warm garage. Explain why the pressure inside the tyre increases as the temperature of the air inside rises, using ideas about particles.

> Eduqas A-Level Physics — 4.1 Thermal physics · Explain · 5 marks

> A bicycle tyre contains a fixed mass of air. When the garage warms up on a sunny day, the pressure inside the tyre is noticed to be higher than it was in the morning.

## Mark scheme (5 marks)

1. The air particles move faster / have greater kinetic energy when the temperature increases
2. The particles collide with the walls of the tyre more frequently
3. Each collision transfers more force / particles hit the walls harder
4. The volume of the tyre stays (approximately) constant / the tyre does not expand significantly
5. More frequent and more forceful collisions on the same area of wall means the pressure increases

## Key terms

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

## 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/a-bicycle-tyre-is-pumped-up-aa015bf1) · Published by Druglandscape Ltd.