A laboratory has several sealed rigid test cells. Each cell contains the same mass of air, but the cells have different internal volumes. The gas in each cell is brought to a different temperature and its pressure is measured. Which change would make this a fair test of how gas pressure varies with temperature?
Use test cells made of the same material so that each one warms equally.
Use the same test cell, with the same air inside, for every temperature.
Use a test cell with a larger internal volume for each higher temperature.
Measure each pressure several times and calculate a mean for each cell.
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.