If the volume of a gas is halved while keeping the temperature constant, what happens to the pressure (Pressure in gases (physics only))

The correct answer is It doubles.

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: If the volume of a gas is halved while keeping the temperature constant, what happens to the pressure (Pressure in gases (physics only)). The correct response is It doubles, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Pressure in gases (physics only), the marking point should connect directly to (Physics only) Apply the relationship pressure x volume = constant for a fixed mass of gas at constant temperature. 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 543 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.