A gas is contained within a closed vessel. Explain, in terms of the behavior of the gas molecules, how they exert a constant pressure on the walls of the vessel. In your explanation, make direct reference to momentum, force, and Newton's laws of motion.
151 exam-style questions on CIE IGCSE Physics 2.1.2a Particle structure and motion in solids, liquids and gases. Each one has a worked solution and a mark scheme showing where the marks go.