How the Freezer Works
Refrigeration is the mechanical process to remove heat from an enclosed space to lower its temperature. The machine uses liquid evaporation for absorbing heat. The liquid known as the refrigerant evaporates at exceptionally low temperatures, producing a freezing temperature inside the machine. The physical concept is that a liquid can be vaporized quickly by compression. The expanding vapor needs kinetic energy which it absorbs from the nearby area. As a result, it loses energy and instantly gets cooler. Cooling by quick gas expansion is the basis of modern refrigeration.