The final component of the cycle is the evaporator. This component transforms the liquid back into a vapor to be pressurized once again by the compressor. This change in state requires a large amount of heat to be pulled from the surrounding area. The evaporator is the component that is actually inside the refrigerator that is used to provide cooling. There are two forms of heat, sensible and latent.
Sensible heat is heat that causes a change in temperature.
The key to a refrigeration cycle is capitalizing on the large amounts of energy required to cause matter to change states, latent heat. By forcing the refrigerant to condense from a gas to a liquid, latent heat is transferred from the refrigerant to the other medium. Conversely, by forcing the liquid refrigerant to change into a gas inside the refrigerator, large quantities of heat can be removed very easily. The reason the latent heat is so important is because large pressure changes are required to cause a measurable change in temperature. This means that in order to maintain a final temperature difference between the refrigerant and the other medium, the initial temperature difference would have to be very large.