A frictionless piston separates a trapped gas from the surroundings. Initially the forces on the piston balance. The external pressure is then increased while the gas temperature stays constant. Which sequence follows?
The piston moves inwards; gas volume decreases; gas pressure decreases.
The piston moves outwards; gas volume increases; gas pressure increases.
The piston moves outwards; gas volume increases; gas pressure decreases.
The piston moves inwards; gas volume decreases; gas pressure increases.
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.