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Although "International Temperature Scale of 1990" has the word "scale" in its title, this is a misnomer that can be misleading. The ITS-90 is not a scale; it is an equipment calibration standard. Temperatures measured with equipment calibrated per ITS-90 may be expressed using any temperature scale such as Celsius, Kelvin, Fahrenheit, or Rankine.
This definition also precisely related the Celsius scale to the Kelvin scale, which defines the SI base unit of thermodynamic temperature with symbol K. Absolute zero, the lowest temperature possible, is defined as being exactly 0 K and −273.15 °C. Until 19 May 2019, the temperature of the triple point of water was defined as exactly 273.16 ...
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 ...
Although this is the lowest absolute temperature described by the model, ... International Temperature Scale of 1990 (ITS-90) – Practical temperature scale;
Starting in 1990, the interpolating formula was further refined with the publication of The International Temperature Scale of 1990. The ITS-90 is published by the Comité Consultatif de Thermométrie and the Comité International des Poids et Mesures. This work provides a 12th order polynomial that is valid over an even broader temperature ...
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.
Mann, Bradley & Hughes 1998 "Global-scale temperature patterns and climate forcing over the past six centuries" Jones et al. 1998 "High-resolution palaeoclimatic records for the last millennium: interpretation, integration and comparison with General Circulation Model control-run temperatures".
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 [12] In the SIA-Library of TEOS-10 implementations to convert outdated into current scales are included.