What is the specific latent heat of fusion?

The correct answer is The energy needed to change the state of one kilogram of a substance from solid to liquid at constant temperature.

Method lens: First identify the measured quantity, then match the equation or particle idea to the command word. This question asks: What is the specific latent heat of fusion. The correct response is The energy needed to change the state of one kilogram of a substance from solid to liquid at constant temperature, because specific heat capacity links energy, mass, material and temperature change. In Temperature changes in a system and specific heat capacity, the marking point should connect directly to apply MS 3b and MS 3c skills when rearranging and calculating with the specific heat capacity 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 356 is distinct because it uses this exact question context and the method lens rather than a generic particle-model sentence.