A scientist compares the air at a beach at sea level with the air at a mountain summit 2400 m above sea level.
Which statement correctly compares the air at the summit with the air at the beach?
The air molecules at the summit are closer together, because less air above presses on them
There are no air molecules at the summit, because the summit is closer to space
The air molecules at the summit are more spread out, so there are fewer in each cubic metre
The air molecules at the summit are smaller, so each cubic metre of air has less mass
108 exam-style questions on AQA GCSE Physics 5.5 Pressure and pressure differences in fluids, covering 5.5.1 Pressure in a fluid and 5.5.2 Atmospheric pressure. Each one has a worked solution and a mark scheme showing where the marks go.