Olof Celsius Olof Celsius Olof Celsius (the elder) (19 July 1670 – 24 June 1756) was a Swedish botanist, philologist and clergyman, He was a professor at Uppsala University, Sweden. Celsius was a mentor of the botanist and scientist Carl Linnaeus. Celsius wrote his most famous book on biblical plants, "Hierobotanicon", in 1745-47. Olof Celsius's nephew Anders Celsius was an astronomer who invented a temperature scale where 100 represented the freezing point of water and 0 represented the boiling point. Jean-Pierre Christin, in 1744 reversed the scale to create the centigrade scale, renamed in 1948 to the Celsius scale in use today.
Scale of temperature is the function of the temperatures only: In addition, a reversible heat engine operating between temperatures "T" and "T" must have the same efficiency as one consisting of two cycles, one between "T" and another (intermediate) temperature "T", and the second between "T" and "T". This can only be the case if Specializing to the case that formula_5 is a fixed reference temperature: the temperature of the triple point of water. Then for any "T" and "T", Therefore, if thermodynamic temperature is defined by then the function "f", viewed as a function of thermodynamic temperature, is and the reference temperature