kelvin (K)

kelvin (K): A unit of thermodynamic temperature, taken as one of the base units of the International System of Units (SI). The kelvin is defined by setting the thermodynamic temperature of the triple point of water at 273.16 K. Note 1: The kelvin was formerly called "degree Kelvin." The term "degree Kelvin" is now obsolete. No degree symbol is written with K, the symbol for kelvin(s). Note 2: In measuring temperature intervals, the degree Celsius is equal to the kelvin. The Celsius temperature scale is defined by setting 0 °C equal to 273.16 K.

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