(thermodynamics) The ratio of the temperature of a substance to its critical temperature.
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(thermodynamics) The ratio of the temperature of a substance to its critical temperature.
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In thermodynamics, the reduced temperature of a fluid is its actual temperature, divided by its critical temperature:

where the actual temperature and critical temperature are expressed in absolute temperature scales (either Kelvin or Rankine). It is often used in thermodynamical formulas, e.g. the Peng-Robinson equation of state.
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