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Heat transfer is the process of heat energy flowing from a source at a high temperature to a load at a lower temperature. The three forms of heat transfer are conduction, convection, and radiation (infrared.) Conduction occurs when there is a transfer of heat energy due to a temperature difference within an object or between objects in direct physical contact. Convection is the result of a transfer of heat energy from one object to another via a moving fluid or gas. Radiation heat transfer can occur by infrared, ultraviolet, microwave and radiowaves. Infrared (electromagnetic radiant infrared energy) is the transfer of heat energy via invisible electromagnetic energy waves that can be felt as the warmth from the sun or a downwind fire or other hot object.