Reproduced with
the permission
of Metrologia.
An
important note
about this version
ITS90 Text
Contents
Units of Temperature
and Introduction from
Metrologia
27, 310 (1990)
Principles of the International Temperature Scale of 1990 (ITS90)
Definition of the International Temperature Scale of 1990
Supplementary Information and Differences from Earlier Scales & Appendix
List of Tables
ITS90 Tables
Defining Fixed Points of the ITS90
Effect of pressure on the temperatures of some defining fixed points
Values of the constants for the helium vapour pressure Eq3 (3), and the temperature range for which each equation, identified by its set of constants, is valid.
The constants A0, Ai, Bi, Co, Ci, D0 and Di in the reference functions of equations (9a);(9b);(10a) and (10b) respectively
Deviation functions and calibration points for platinum resistance thermometers in the various ranges in which they define T
_{90}
Difference between ITS90 and EPT76, and between ITS90 and IPTS68 for specified values of T
_{90}
and t
_{90}
Summary Table
A Useful
Summary Table
;
not
part of the ITS90 text.

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