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Fugacity Coefficient from van der Waals Equation Calculator

Deviation from ideal gas behaviour — fugacity f = φP.

Calculates the van der Waals fugacity coefficient φ = exp[(b/(Vm−b)) − (2a/(RT·Vm))], where a and b are VdW constants, for a real gas at given T and Vm.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

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Results

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

ln φ ≈ b/(Vm−b) − 2a/(RT·Vm)

In depth

Calculates the van der Waals fugacity coefficient φ = exp[(b/(Vm−b)) − (2a/(RT·Vm))], where a and b are VdW constants, for a real gas at given T and Vm.