basic

van der Waals Real Gas Pressure Calculator

Real gas pressure with intermolecular corrections.

Compute the pressure of a real gas using the van der Waals equation P = nRT/(V − nb) − a·n²/V², with the gas-specific constants a (L²·atm/mol²) and b (L/mol). Compare against the ideal-gas pressure for the same conditions.

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

Inputs

mol
L
K
L²·atm/mol²
L/mol

Results

Enter values and click Calculate to see 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

P = nRT / (V − nb) − a · n² / V², R = 0.0821 L·atm/(mol·K).

In depth

Compute the pressure of a real gas using the van der Waals equation P = nRT/(V − nb) − a·n²/V², with the gas-specific constants a (L²·atm/mol²) and b (L/mol). Compare against the ideal-gas pressure for the same conditions.