Thermodynamic Scale

triple point of water

Thermodynamic scale based on 2 fixed points:

  • Absolute zero
  • Triple point of water – ice, water, water vapor coexist in equilibrium – convenient and easily reproducible,  0.01°C and 611.73 Pa


$T_{c} = T – 273.15$, where $T_{c}$ is in Celsius scale, T is in Kelvin scale.

Thermodynamic scale is shifted so that we can conveniently compare the experimental value with the true value.


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