What occurs when the volume of a gas is decreased at constant temperature (Increasing the pressure of a gas (physics only) (HT only))

The correct answer is The pressure increases.

Practical lens: Link apparatus, readings, and uncertainty to the exact measurement named in the objective. This question asks: What occurs when the volume of a gas is decreased at constant temperature (Increasing the pressure of a gas (physics only) (HT only)). The correct response is The pressure increases, 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) Use the particle model to explain energy transfer during gas compression. 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 626 is distinct because it uses this exact question context and the practical lens rather than a generic particle-model sentence.