Explain how gas molecules exert a force on a solid surface.
Explain the decrease in pressure of a gas when its volume is increased at constant temperature.
A cylinder of volume 4.0×103 cm34.0 \times 10^3\text{ cm}^34.0×103 cm3 contains air at a pressure of 9.0×105 Pa9.0 \times 10^5\text{ Pa}9.0×105 Pa.
A leak develops so that air gradually escapes from the cylinder until the air remaining in the cylinder is at atmospheric pressure. The atmospheric pressure is 1.0×105 Pa1.0 \times 10^5\text{ Pa}1.0×105 Pa.
Calculate the volume of the escaped air, when measured at atmospheric pressure. Assume that the temperature of the air stays constant.
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.