That's because the liquid in which you dipped it is evaporating, and as it does, it extracts heat from the skin of the finger and air around it). It immediately begins to feel cooler than the others, particularly if exposed to some air movement. (You can test this principle by simply wetting your finger and holding it up. The refrigeration cycle is based on the long known physical principle that a liquid expanding into a gas extracts heat from the surrounding substance or area. Refrigerants, are chemical compounds that are alternately compressed and condensed into a liquid and then permitted to expand into a vapor or gas as they are pumped through the mechanical refrigeration system to cycle. Mechanical refrigeration, is the utilization of mechanical components arranged in a " refrigeration system" for the purpose of transferring heat.Į). Removal of heat lowers the temperature and may be accomplished by use of ice, snow, chilled water or mechanical refrigeration.ĭ). Refrigeration, or cooling process, is the removal of unwanted heat from a selected object, substance, or space and its transfer to another object, substance, or space. Theoretically this zero point would be 459.69 degrees below zero on the Fahrenheit thermometer scale, or 273.16 degrees below zero on the Celsius thermometer scale.Ĭ). Another definition describes it as the absence of heat, no process yet has been devised of achieving "absolute zero," the state in which all heat has been removed from any object, substance, or area. Cold is a relative term referring to the lack of heat in an object, substance, or area. It is important to remember that heat energy travels in only one direction from a warmer to a cooler object, substance, or area.ī). As a form of energy it can be neither created or destroyed, although other forms of energy may be converted into heat, and vice versa. Heat exists everywhere to a greater or lesser degree. Heat is a form of energy transferred by virtue of a difference in temperature. Before getting into the fundamentals of refrigeration, a few basic definitions should be considered:Ī).
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