A gas has a pressure of 200,000 Pa and occupies a volume of 0.5 m³. What will be the volume of the gas if the pressure is increased to 400,000 Pa at constant temperature (Pressure in gases (physics only))

The correct answer is 0.25 m³.

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: A gas has a pressure of 200,000 Pa and occupies a volume of 0.5 m³. What will be the volume of the gas if the pressure is increased to 400,000 Pa at constant temperature (Pressure in gases (physics only)). The correct response is 0.25 m³, 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) Calculate volume when pressure changes 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 555 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.