CGPM

According to Wikipedia — Kelvin — the 13th General Conference on Weights and Measures (CGPM), in 1967–1968, changed the name of the Kelvin scale to simply "kelvin" (symbol K).

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According to Wikipedia — Kelvin (Usage conventions) — prior to the 13th General Conference on Weights and Measures (CGPM) in 1967–1968, the unit kelvin was called a "degree", the same as with the other temperature scales at the time.

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Before the 13th CGPM, the plural form was "degrees absolute".

Cool – Literally – Extrasolar Planet Imaged | Universe Today 2009

The 13th CGPM changed the name to simply "kelvin" symbol K.

Cool – Literally – Extrasolar Planet Imaged | Universe Today 2009

After the revision of the Meter Convention by the 6th CGPM in 1921, which extended the scope and responsibilities of the BIPM to other fields in physics, and the subsequent creation of the CCE (now CCEM) by the 7th CGPM in 1927, the Giorgi proposal was thoroughly discussed by the IEC and the IUPAP and other international organizations.

International System of Units (SI) 2008

Following an international inquiry by the BIPM, which began in 1948, the 10th CGPM, in 1954, approved the introduction of the ampere, the kelvin and the candela as base units, respectively, for electric current, thermodynamic temperature and luminous intensity.

International System of Units (SI) 2008

In order to define the unit of time more precisely, the 11th General Conference on Weights and Measures (CGPM) (1960) adopted a definition given by the International Astronomical Union which was based on the tropical year.

Second 2008

The name International System of Units (SI) was given to the system by the 11th CGPM in 1960.

International System of Units (SI) 2008

Considering that a very precise definition of the unit of time is indispensable for the International System, the 13th CGPM (1967) decided to replace the definition of the second by the following (affirmed by the International Committee for Weights and Measures (CIPM) in 1997 that this definition refers to a cesium atom in its ground state at a temperature of 0 K):

Second 2008

In 1889 the 1st CGPM sanctioned the international prototypes for the meter and the kilogram.

International System of Units (SI) 2008