Which statement correctly explains why atmospheric pressure is greatest at sea level?
The average temperature of the air is highest at sea level, which increases pressure.
There is a larger number of air molecules in the column of air above, resulting in a greater force per unit area.
The strength of the Earth's gravitational field increases rapidly as you move closer to sea level.
The individual mass of each nitrogen and oxygen molecule is greater at sea level.
33 exam-style questions on OCR GCSE Physics Pressure. Each one has a worked solution and a mark scheme showing where the marks go.