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Title: Tracking Embodiments Of Intrinsic Standmds Suhmary
Author: P. J. Spellman,
Source: 1993 Measurement Science Conference
Year Published: 1993
Abstract: Triple, freeze or melt points of very pure substances have been selected as fixed points of ITS 90. They have been assumed to be pure and either under the vapour pressure of the cell material, in Triple Point Cells, or at 1 atmosphere in freeze or melt point cells. The temperature assigned is the temperature at the surface of the cell contents. To obtain perfect, or near to perfect results the cells are assumed to be in concentric shells of liquid/solid/liquid (as in the water triple point) or solid/liquid/solid (as a freeze cell).

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