Trouton's rule states that for a liquid to vaporize, this thermodynamic qua
Trouton's rule states that for a liquid to vaporize, this thermodynamic quantity is approximately equal to 21 times the universal gas constant times the boiling temperature. The virial expansion for this state function is proportional to the square of temperature. This natural function of entropy and pressure is constant in throttling processes, a fact that is exploited in Joule-Thomson cooling. Determined experimentally by measuring the heat associated with a constant-pressure process, for 10 points, identify this thermodynamic potential defined as the internal energy plus the pressure times the volume.
Trouton's rule states that for a liquid to vaporize, this thermodynamic quantity is approximately equal to 21 times the universal gas constant times the boiling temperature.
{enthalpy}