Refrigerant mediums will evaporate when?

Refrigerant mediums evaporate when latent heat is added because this process is fundamental to how refrigeration and air conditioning systems function. When latent heat is supplied to a liquid refrigerant, it absorbs this heat energy, which allows it to overcome the attractive forces between its molecules. As a result, the liquid transitions into its gaseous state, effectively evaporating. This evaporation process is crucial for heat exchange, as the refrigerant absorbs heat from the environment (such as inside a refrigerator or air-conditioning unit) while it changes phase from liquid to gas, thereby cooling the surrounding area.

The other choices involve conditions that do not effectively lead to evaporation. For instance, increasing pressure typically raises the boiling point of the refrigerant, making it less likely to evaporate. Decreasing temperature can condense a refrigerant rather than promote its evaporation. Lastly, diluting a refrigerant may not necessarily influence its phase change as directly as the addition of latent heat does. Thus, the process of adding latent heat is essential for evaporation, directly linking it to the operation of refrigeration systems.