ABSTRACT
In the SI system, thermodynamic temperature or absolute temperature is expressed in kelvin (K), andCelsiustemperatureisexpressedindegreesCelsius(°C).TheCelsiustemperatureisde¢nedas
0 273 15° =C K. (5.1)
andatemperatureintervalordifferenceexpressedinkelvinandindegreesCelsiusareidentical. 0°C is 0.01K below the triple point of water. The temperature coef¢cient is expressed in reciprocal kelvin (K−1).
