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Unformatted text preview: 1 5- 10 S E CON D AR Y R EFEREN CE P OI N T S ON TH E I T S-90 T EM P ER A TU RE S C A LE T he International Temperature Scale of 1990 is described in Section 1 of this Handbook , where the defining fixed points are listed. The Consultative Committee on Thermometry (CCT) of the International Committee on Weights and Measures (CIPM), which oversees the temperature scale, has recom- mended a number of secondary reference points whose values have been accurately determined with respect to the primary fixed points. The most accurate of these, referred to as “first quality points”, satisfy several criteria involving purity of the material, reproducibility, and documentation of the measure- ments. The CCT also lists “second quality points” that do not yet satisfy all the criteria but are still useful. Taken together, these secondary reference points, help fill in the gaps between the primary fixed points. The table below describes these secondary reference points....
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This note was uploaded on 12/31/2011 for the course CHEMISTRY 101 taught by Professor Dr.dason during the Fall '08 term at Davenport.
- Fall '08