Explain why temperature remains constant during a change of state, even though energy is transferred.

During a change of state, energy is used to alter the arrangement of particles rather than increasing their kinetic energy. As a result, while energy is being absorbed or released, the temperature remains constant until the phase change is complete.

Boundary lens: Keep this separate from nearby specification points that use similar words but test a different idea. This question asks: Explain why temperature remains constant during a change of state, even though energy is transferred. The correct response is During a change of state, energy is used to alter the arrangement of particles rather than increasing their kinetic energy. As a result, while energy is being absorbed or released, the temperature remains constant until the phase change is complete., because specific latent heat concerns energy transferred during a state change with no temperature rise. In Changes of state and specific latent heat, the marking point should connect directly to apply MS 3b and MS 3c skills when rearranging and calculating with the specific latent heat equation. 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 Internal energy and energy transfers, 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 442 is distinct because it uses this exact question context and the boundary lens rather than a generic particle-model sentence.