The kelvin, the unit of thermodynamic temperature, is the fraction 1/273,16 of the thermodynamic temperature of the triple point of water. The decision was made at the 13 th General Conference on Weight and Measures on october 13, 1967 that the name of the unit of thermodynamic temperature would change from degree Kelvin (symbol oK) to kelvin (symbol K).....
Handbook of Chemistry and Physics 59th edition 1978-79