A climber walks to the top of a high mountain.
Why is the atmospheric pressure lower at the top of the mountain than at the bottom?
The air at the top is colder, so the particles stop moving
There is less air above the climber pushing down
The air at the top is closer to the Sun, so it expands
Gravity is stronger at the top, so the air is pulled down
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.