Practise explaining how changing gas temperature and volume affects pressure using the particle model with CAIE IGCSE Physics questions and mark schemes.
The temperature of a fixed mass of gas at constant volume changes from 300 K to 400 K .
State and explain, in terms of particles, the effect on the pressure of the gas.
statement
explanation
increased (pressure)
particles of gas move faster OR have more KE / momentum / velocity
any two from from:
- more frequent collisions of particles (with walls)
- particles collide (with walls) with a larger force OR larger impulse
- (greater change in momentum of particles) causes greater force (on walls)
- pressure = force / area