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Letter - K
Kelvin or K

A temperature scale that is directly related to the heat energy within a body. Formally, a temperature scale in which the ratio of the temperatures of two reservoirs is equal to the ratio of the amount of heat absorbed from one of them by a heat engine operating in a Carnot Cycle to the amount of heat rejected by engine to the other reservoir. The temperature of the triple point of water (in this scale) is defined as 273.16 K. To convert from Celsius, K=C+273.16.

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