A student places a balloon filled with air into a bowl of hot water. The hot water warms the air inside the balloon.
Suggest what happens to the balloon as the air inside it becomes warmer than the surroundings.
Use ideas about molecules to explain your answer to (a)(i).
The student uses a bicycle pump to inflate a bicycle tire. The student applies a force of 48 N48\text{ N}48 N to the pump handle. The force acts on an area of 8.0 cm28.0\text{ cm}^28.0 cm2.
Calculate the pressure exerted on the pump handle. Include the unit.
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.