A sealed packet of crisps is carried up a mountain. The packet swells as it goes higher.
Assume the temperature stays the same.
Which statement explains this?
The air inside the packet gets warmer, so the particles get bigger
The air pressure outside increases, pushing the sides of the packet out
More gas particles form inside the packet as it is carried higher
The air pressure outside the packet decreases, so the gas inside expands
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.