A laboratory transports an air sample in a sealed rigid metal capsule fitted with a pressure sensor. The capsule cools in a refrigerated vehicle.
| Temperature in ∘C^\circ\text{C}∘C | Pressure in kPa\text{kPa}kPa |
|---|---|
| 27 | 112 |
| 17 | 108 |
| 7 | 104 |
| -3 | 101 |
Describe how the pressure changes as the temperature decreases. Use data from the table in your answer.
Explain the change in pressure in terms of the particles in the air.
A student concludes that the density of the air inside the capsule decreases as it cools.
Explain whether the student's conclusion is correct.
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.