| Definition: | temperature scale adopted by the International Committee on Weights and Measures (CIPM) in 1989 for the purpose of practical measurements NOTE 1 The quantities corresponding to thermodynamic temperature and Celsius temperature defined by this scale are denoted T90 and t90, respectively, where t90 = T90 − T0 with T0:= 273,15 K. NOTE 2 The units of T90 and t90 are the kelvin, symbol K, and the degree Celsius, symbol °C, respectively.
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