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The International Temperature Scale of 1990 (ITS-90) is an equipment calibration standard specified by the International Committee of Weights and Measures (CIPM) for making measurements on the Kelvin and Celsius temperature scales. It is an approximation of thermodynamic temperature that facilitates the comparability and compatibility of ...
International temperature scale of 1990. ITS-90 is designed to represent the thermodynamic temperature scale (referencing absolute zero) as closely as possible ...
For practical measurements, the International Temperature Scale of 1990 defines several fixed points and interpolation procedures. Celsius temperature: t, φ: degree Celsius °C: The degree Celsius is a special name for the unit kelvin, for use in stating values of Celsius temperature. t = T − T 0, where T 0 = 273.15 K linear expansion ...
Since the standardization of the kelvin in the International System of Units, it has subsequently been redefined in terms of the equivalent fixing points on the Kelvin scale, so that a temperature increment of one degree Celsius is the same as an increment of one kelvin, though numerically the scales differ by an exact offset of 273.15.
Today there is an absolute thermodynamic temperature scale. Internationally agreed temperature scales are designed to approximate this closely, based on fixed points and interpolating thermometers. The most recent official temperature scale is the International Temperature Scale of 1990.
In TEOS-10 the current standard for temperature scales, ITS-90 (International Temperature Scale of 1990) is used, while EOS-80 used the IPTS-68 (International Practical Temperature of 1968). [12] In the SIA-Library of TEOS-10 implementations to convert outdated into current scales are included.
1.4 Why do you see the mixed use of the kelvin and Celsius scales? 1.5 Typography hints. 2 "±0" notation. 2 comments. ... Talk: International Temperature Scale of 1990.
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