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The scale presented in this document was proposed by the International Committee of Weights and Measures in 1974 and adopted by the 15th General Conference of Weights and Measures in 1975. It constitutes only an amendment of the International Practical Temperature Scale of 1968 (IPTS-68), not a replacement. Any measured temperature, T68, remains unchanged by this amendment of the IPTS-68.
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Comité International des Poi Mesures (1976) studied this question.
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