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He Kelvin is a unit of temperature which is used within the framework of a scale developed by the Irish physicist William Thomson (1824-1907), better known as Lord kelvin . This scale measures the temperature value starting at the Absolute zero : the lowest temperature that can exist.

He symbol of this unit is K . Taking the base of degree centigrade or Celsius , Thus, 0 K equals -273.15 ° C . This means that 0 K is the Absolute zero , the point at which atoms and molecules have the least possible thermal energy. There is no macroscopic system that can reach a temperature below this absolute zero, hence its name.

From this starting point, the increase of a kelvin also means the increase of a degree centigrade or Celsius . In this way, 1K is equal to -272.15 ° C ; 2k It is equivalent to -271.15 ° C and so on. On the other hand, it can be stated that 0 ° C is the same as 273.15 K .

The temperature measured in Kelvin is known as absolute temperature . Usually the scale is used in the chemistry , in physics and other scientific fields. In the field of photography, film and video, Kelvin is a reference of the call color temperature (which compares a color of the luminous spectrum with the tone of the light that would emit a black body that heats at a certain temperature; a black body, in turn, is an ideal object that absorbs all of the radiant energy and the light that falls on him).

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