K (Kelvin)
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Thermodynamic temperature scale measurement. In 1933, the International Committee of Weights and Measures adopted the temperature at which water, ice, and water vapor coexist in equilibrium as a fixed point, the "triple point of water"; its value was set as 273.16. The unit of temperature on this scale is called the Kelvin, after William Thompson Lord Kelvin, and its symbol is K (no degree symbol used). In photography it is used to measure the color temperature of light at different wavelengths.
