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Critical Temperature and Pressure from van der Waals Constants Calculator

T_c = 8a/(27Rb), P_c = a/(27b²).

Calculates the critical temperature T_c = 8a/(27Rb) and critical pressure P_c = a/(27b²) of a real gas from its van der Waals constants a and b.

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

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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

T_c = 8a/(27Rb); P_c = a/(27b²)

In depth

Calculates the critical temperature T_c = 8a/(27Rb) and critical pressure P_c = a/(27b²) of a real gas from its van der Waals constants a and b.