Kelvin
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The kelvin is the base unit for temperature in the International System of Units. The Kelvin scale is an absolute temperature scale that starts at the lowest possible temperature, taken to be 0 K. By
An ice water bath offered a practical calibration point for thermometers (shown here in Celsius) before the physical nature of heat was well understood.
Lord Kelvin, the namesake of the unit of measure.
Thermometer showing temperature in kelvin and degrees Celsius
Rankine scale
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The Rankine scale is an absolute scale of thermodynamic temperature named after the University of Glasgow engineer and physicist W. J. M. Rankine, who proposed it in 1859. As on the Kelvin scale, whic
W.J. Rankine
