A student heats a sealed flask of air. The volume of the flask does not change.
The table shows the student's results.
Table
| Temperature (∘C{}^\circ\text{C}∘C) | Pressure (kPa\text{kPa}kPa) |
|---|---|
| 20 | 100 |
| 40 | 107 |
| 60 | 114 |
| 80 | 121 |
Which conclusion is correct?
The pressure is directly proportional to the temperature in ∘C{}^\circ\text{C}∘C
The pressure increases by the same amount for each 20 ∘C20\ {}^\circ\text{C}20 ∘C rise
The pressure increases by a larger amount for each 20 ∘C20\ {}^\circ\text{C}20 ∘C rise
The pressure doubles when the temperature in ∘C{}^\circ\text{C}∘C doubles
50 exam-style questions on OCR GCSE Physics 1.3 Pressure, covering 1.3.1 Molecular motion, temperature and gas pressure, 1.3.2 Gas pressure at constant volume, 1.3.3 Compressing and expanding gases, 1.3.4 Gas volume and pressure at constant temperature, 1.3.5 Doing work on a gas, 1.3.6 The Earth's atmosphere and atmospheric pressure, 1.3.7 Atmospheric pressure and height, 1.3.8 Floating and sinking, 1.3.9 Pressure in liquids and upthrust, and 1.3.10 Pressure differences with depth. Each one has a worked solution and a mark scheme showing where the marks go.