international temperature scale


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international temperature scale

[¦in·tər¦nash·ən·əl ′tem·prə·chər ‚skāl]
(thermodynamics)
A standard temperature scale, adopted in 1990, that approximates the thermodynamic scale, based on assigned temperature values of 17 thermodynamic equilibrium fixed points and prescribed thermometers for interpolation between them. Abbreviated ITS-90.
References in periodicals archive ?
Preston-Thomas, The International Temperature Scale of 1990 (ITS-90), Metrologia 27, 3-10 (1990).
Stimson, The International Temperature Scale of 1948, J.
Pokhodun, On the International Temperature Scale of 1990 (JTS-90), Part I: Some Definitions, Metrologia 34, 427-429 (1997).
Furukawa, Guidelines for Realizing The International Temperature Scale of 1990 (ITS-90), NIST Technical Note 1265, August 1990, 190 p.
Supplementary Information for the International Temperature Scale of 1990, Sevres, Bureau International des Poids et Mesures, 1990.
Sakurai, The Platinum Resistance Thermometer Range of the International Temperature Scale of 1990, Metrologia 28, 317-325 (1991).
These international temperature scales are defined in terms of fixed points, vapor pressures of some liquefied gases, thermometers that can be measured very precisely and fairly easily, and equations that relate measurements of these thermometers to temperatures of the scale.
Table 1 lists the fixed points and their assigned temperatures of all the International Temperature Scales that have been adopted.
The International Temperature Scales that followed the NHS were based on fixed points with assigned temperature values based on measurements of the thermodynamic temperature, standard thermometers and interpolation equations.
The purpose of the ITS-27 and of the subsequent International Temperature Scales has been well expressed in the introduction to the ITS-48 [4]:

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