What happens to the pressure of a gas if its temperature increases while the volume remains constant (Pressure in gases (physics only)) (Pressure in gases (physics only); definition focus: (Physics only) Identify pressure in pascals and volume in metres cubed when using the pressure-volume relationship) (Pressure in gases (physics only); definition focus: (Physics only) Identify pressure in pascals and volume in metres cubed when using the pressure-volume relationship)

The correct answer is The pressure increases.

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: What happens to the pressure of a gas if its temperature increases while the volume remains constant (Pressure in gases (physics only)) (Pressure in gases (physics only); definition focus: (Physics only) Identify pressure in pascals and volume in metres cubed when using the pressure-volume relationship) (Pressure in gases (physics only); definition focus: (Physics only) Identify pressure in pascals and volume in metres cubed when using the pressure-volume relationship). The correct response is The pressure increases, 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) Identify pressure in pascals and volume in metres cubed when using the pressure-volume relationship. 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 567 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.