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'''Refrigeration''' is the process of transferring heat energy from one location to another for the purpose of cooling an area. This process is modernly used in things such as refrigerators for food preservation and growth control, and air conditioning for reducing the temperature in buildings. This process goes against the natural process of heat energy flowing from hot to cold.
==Non-cyclic refrigeration==
Non-cyclic (no cycle) refrigeration is a one-way process which uses a cold substance to cool down other items and substances. The most common example of this is the use of ice or freezer packs in an insulated container. <br />
Ice boxes were a formerly popular device which also used this method. Large sheets of ice were loaded into the back of an ice box, which would keep the contents of the insulated box cool for extended periods of time, while the ice slowly melted into a tray. An "ice man" would come around periodically to sell more ice, so that food could stay cold. Each winter, ice would be dug out of ponds or rivers, and stored in quantity, for sale throughout the following seasons.
==Cyclic refrigeration==
[[File:Refrigeration - Single stage vapor compression.png|thumbnail|A single-stage vapor compression refrigeration system]]
Cyclic refrigeration is a two-way progress which uses the properties of a liquid/gas to force heat from one space into another.