What is specific latent heat?

The correct answer is The energy needed to change the state of one kilogram of a substance with no change in temperature..

Application lens: Apply the rule to the specific sample or situation instead of reciting a broad fact. This question asks: What is specific latent heat. The correct response is The energy needed to change the state of one kilogram of a substance with no change in temperature., because density links mass and volume, so the answer must preserve which quantity is being calculated. In Changes of state and specific latent heat, the marking point should connect directly to recall and apply the equation energy for a change of state = mass x specific latent heat. 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 379 is distinct because it uses this exact question context and the application lens rather than a generic particle-model sentence.