Describe what happens to the kinetic energy of gas particles when they are compressed quickly.

When gas particles are compressed quickly, their kinetic energy increases due to the work done on them. This increase in kinetic energy can cause the temperature of the gas to rise.

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: Describe what happens to the kinetic energy of gas particles when they are compressed quickly. The correct response is When gas particles are compressed quickly, their kinetic energy increases due to the work done on them. This increase in kinetic energy can cause the temperature of the gas to rise., because gas pressure comes from particle collisions with container walls. In Increasing the pressure of a gas (physics only) (HT only), the marking point should connect directly to (Physics only) (HT only) Link work done on gas particles to increased particle kinetic energy. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Particle model and pressure, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 615 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.