Once the difference (T - [T.sub.90]) is known for a range of temperatures, this information can be used to improve future versions of the international temperature scale.
These measurements we hope, will contribute to significant improvements the thermodynamic accuracy of the next international temperature scale.
The future international temperature scale could include recommendations for absolute radiometric determinations of temperature.
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.
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.