February/March 2026 Paper 42

Atmospheric pressure is $1.0\times 10^5$ Pa. A volume of 1.02 m${}^3$ of air at atmospheric pressure is pumped into a car tyre. The pressure of the air when it is inside the tyre is $2.6\times 10^5$ Pa. Calculate the volume of the air when it is in the car tyre.

Describe the structure of a gas in terms of the separation, arrangement and motion of particles.

Explain, in terms of particles, why the internal energy of the gas decreases when the gas is at a lower temperature.