Abstract
Ninth General Conference of Weights and Measures held in Paris in October adopted The International Temperature Scale of 1948, being a revision of The International Temperature Scale of 1927. This article gives the essential details of the new scale and discusses the changes which have been made and the reasons underlying them. most important differences are: (1) the use of a value of 960.8° instead of 960.5° C for the freezing point of silver; (2) the adoption of the Planck equation instead of that of Wien for extrapolation to high temperatures; (3) the use of a value of 1.438 instead of 1.432 for the constant C2 in the Planck equation; (4) the use of the name Celsius instead of Centigrade. effect of these changes on the numerical values of temperature is given in graphical form. reproducibility of the scale is discussed and an estimate is made of the accuracy with which it represents the thermodynamic scale.
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