A diver is at a depth of 35 m beneath the surface of a lake. She carries a cylinder of compressed air on her back.
Explain how the air molecules exert a pressure on the inside surface of the cylinder.
The diver gradually uses up the air in the cylinder. Explain, in terms of molecules, why the pressure falls, assuming the temperature remains constant.
The density of the water in the lake is 1000 kg/m^{3}, the gravitational field strength ggg is 10 N/kg, and the atmospheric pressure at the surface is 1.0×105 Pa1.0 \times 10^{5}\text{ Pa}1.0×105 Pa.
Calculate the total pressure at a depth of 35 m beneath the surface of the lake.
188 exam-style questions on CIE IGCSE Physics Pressure, covering Pressure. Each one has a worked solution and a mark scheme showing where the marks go.