When gas molecules rebound from the wall of a container, they exert a force on the wall, leading to pressure. What is the microscopic cause of this force and pressure?
the change in kinetic energy of the molecules.
the change in momentum of the molecules.
the change in potential energy of the molecules.
the change in speed of the molecules.
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.