Van der Waals Equation Calculator

Free calculate pressure, volume, or temperature using the van der waals equation for real gases. account for molecular size and intermolecular forces.

Input Parameters

Results

Enter parameters to calculate pressure

Van der Waals Equation

Van der Waals Equation

(P + a(n/V)²)(V - nb) = nRT

Where a = attraction parameter, b = volume parameter

Solving for Pressure

P = (nRT)/(V - nb) - a(n/V)²

Most common calculation

Constants

  • • R = 8.314 J/(mol⋅K)
  • • a accounts for intermolecular forces
  • • b accounts for molecular volume

Common Gas Constants

  • • H₂: a=0.0247, b=0.0000266
  • • N₂: a=0.1408, b=0.0000391
  • • CO₂: a=0.3640, b=0.0000427

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