Explain why a gas may get hotter when it is compressed quickly.

When a gas is compressed quickly, the work done on the gas increases its internal energy. This increase in internal energy raises the kinetic energy of the gas particles, resulting in a higher temperature.

Comparison lens: State both sides of the comparison so the contrast is explicit rather than implied. This question asks: Explain why a gas may get hotter when it is compressed quickly. The correct response is When a gas is compressed quickly, the work done on the gas increases its internal energy. This increase in internal energy raises the kinetic energy of the gas particles, resulting in a higher temperature., 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) Explain why a gas may get hotter when it is compressed quickly. 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 605 is distinct because it uses this exact question context and the comparison lens rather than a generic particle-model sentence.