Standard Liquid Volume

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Standard liquid volume is the liquid volume of the phase at 15.56 C and 1 atm. If the species is a vapor at these conditions then the volume is obtained using the density at its bubble point temperature. For a solid the volume is calculated at the super saturation conditions.

The volume of every neutral species in OLI Databanks are calculated as follows:

  • The Standard Liquid Volume of a pure component is calculated using its liquid density at 15.56C and 1 atm.
  • If the pure component is a vapor liquid at these conditions (e.g., methane), then volume is computed using the component density at its bubble point temperature.
  • For all remaining species the liquid volume is calculated using 0.02 moles of the neutral species in 1 mole of water (adjusting the amount of the neutral to prevent any vapor formation). The solution is treated as supersaturated (No solid formation) and the volume of the neutral species is calculated as follows:
         Volume neutral species = (volume solution – volume 1 mole H2O)/.02 

If the standard liquid volume is supplied in the DIPPR databank, then this volume is used.

In addition to the above rules, a linear regression is used to calculate the volume of all remaining species. The standard liquid volume is calculated as follows:

         Standard Volume Equation.png