An aircraft is at cruising height, where the atmospheric pressure outside is lower than at sea level.
Which statement explains this difference?
Fewer air particles collide with each unit area each second at cruising height.
The air particles exert a greater force in each collision at cruising height.
Gravity does not act on the air at cruising height, so the air particles have no weight.
Air particles collide with each unit area more often at cruising height.
132 exam-style questions on Edexcel GCSE Physics 15.2 Pressure in fluids, covering 15.2.1 Atmospheric pressure and height, 15.2.2 Pressure in fluids, 15.2.3 Pressure, force and area, 15.2.4 Pressure and depth, 15.2.5 Pressure in liquids: depth and density, 15.2.6 Upthrust, and 15.2.7 Floating and sinking. Each one has a worked solution and a mark scheme showing where the marks go.