Electronic components are tested inside a sealed rigid chamber containing air.
During one test, the chamber is heated while the pressure outside remains at atmospheric pressure. No air enters or leaves the chamber.
| Stage of test | Temperature of air in ∘C^\circ\text{C}∘C | Pressure of air in kPa\text{kPa}kPa |
|---|---|---|
| start | 18 | 102 |
| end | 63 | 118 |
Convert each air temperature in the table to kelvin.
Give the rise on the kelvin scale between the start and end readings.
A student says:
'The pressure increased because heating made all the air particles move towards the chamber door.'
Explain why the student is wrong.
The operating instructions state that the chamber must return to room temperature before its door catch is released.
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.