A sample of gas is sealed inside a container. The volume of the container is decreased while the temperature of the gas is kept constant.
Which statement explains why the pressure of the gas increases?
The average speed of the gas particles increases.
The gas particles collide with the walls of the container more frequently.
The mass of each gas particle increases.
The average force of each individual collision increases.
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.