Final answer:
Latent heat refers to the energy absorbed during a phase change without a temperature increase. The only change involving latent heat from the provided options is when liquid becomes vapor while absorbing heat. This process involves the absorption of energy necessary for the transition without raising the temperature of the liquid.
Explanation:
Understanding Latent Heat
Latent heat is the energy absorbed or released during a phase change of a substance, such as the transition from liquid to vapor without changing temperature. Among the options provided, the change that involves latent heat is:
- Liquid becoming vapor while absorbing heat.
During this process, the liquid absorbs energy in the form of heat, which is necessary to break the intermolecular bonds and transform it into vapor. This heat is referred to as latent heat because it does not raise the temperature of the liquid; instead, it is used for the phase change itself.
In contrast, the other options do not involve a phase transition requiring latent heat. For example:
- Vapor becoming warmer without changing state involves sensible heat.
- Liquid becoming cooler without changing state also involves sensible heat.
- Air becoming cooler without moisture condensing involves heat exchanges but not a phase change.
Therefore, latent heat is specifically associated with the phase transition from liquid to vapor as it absorbs heat.
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