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SI brochure, Appendix 1, section 2.5
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9th CGPM, 1948, Resolution 3: triple point of water; thermodynamic scale with a single fixed point; unit of quantity of heat (joule)
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CIPM, 1948 (PV, 21, 88) and 9th CGPM, 1948, Resolution 7: adoption of "degree Celsius"
From three names ("degree centigrade", "centesimal degree", "degree Celsius") proposed to denote the degree of temperature, the CIPM has chosen "degree Celsius".
This name is also adopted by the 9th CGPM.
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10th CGPM, 1954, Resolution 3: definition of the thermodynamic temperature scale
Note: The 13th CGPM (1967-1968, Resolution 4, see below) explicitly defined the kelvin.
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10th CGPM, 1954, Resolution 4: definition of the standard atmosphere
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13th CGPM, 1968-1968, Resolution 3: SI unit of thermodynamic temperature (kelvin)
Note: At its 1980 meeting the CIPM approved the report of the 7th meeting of the CCU which requested that the use of the symbols "°K" and "deg" no longer be permitted.
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13th CGPM, 1967-1968, Resolution 4: definition of the SI unit of thermodynamic temperature (kelvin)
Note: See Recommendation 5 (CI-1989) of the CIPM on the International Temperature Scale of 1990.
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