A driver checks the pressure of the air in a car tyre before and after a long drive.
The volume of the tyre stays the same. No air enters or leaves the tyre.
The Table shows the results.
Table
| Time of reading | Temperature of air in ∘C^{\circ}\text{C}∘C | Pressure of air in kPa\text{kPa}kPa |
|---|---|---|
| before the drive | 5 | 220 |
| after the drive | 35 | 244 |
Convert both temperatures in the Table to kelvin.
Give the increase in temperature of the air in kelvin.
A student says:
'The pressure increased because there are more air particles in the tyre after the drive.'
Explain why the student is wrong.
The tyre manufacturer says that tyre pressures should be checked when the tyres are cold.
Suggest why.
108 exam-style questions on Edexcel GCSE Physics 14.3 Gas pressure and temperature, covering 14.3.1 Gas pressure and particle motion, 14.3.2 Temperature and pressure at constant volume, 14.3.3 Absolute zero and the kelvin scale, 14.3.4 Compressing and expanding gases, 14.3.5 Volume and pressure at constant temperature, and 14.3.6 Doing work on a gas. Each one has a worked solution and a mark scheme showing where the marks go.