CHEMISTRY / REAL GASES

Van der Waals Gas Pressure Calculator

Estimate real-gas pressure with van der Waals attraction and excluded-volume corrections. Review the equation, substituted values, assumptions, and result in one guided chemistry workspace.

01 Calculated in this tab
02 Values stay in this browser tab
03 Use boundary

Use boundary

Calculation path

Estimate real-gas pressure with van der Waals attraction and excluded-volume corrections. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.

Calculation path

P=nRT/(V-nb)-a(n/V)^2

What you provide

Gas amount expressed in mol, using the same scenario as the other inputs
Absolute temperature expressed in K, using the same scenario as the other inputs
Container volume expressed in L, using the same scenario as the other inputs
Attraction constant a expressed in L^2 atm/mol^2, using the same scenario as the other inputs
Excluded-volume constant b expressed in L/mol, using the same scenario as the other inputs

What you receive

Estimated pressure in atm from the stated equation
A symbolic formula plus substituted working with your values
Visible assumptions, field guidance, and an authoritative learning reference

Use boundary

Choose the maximum decimal places shown. This does not increase source accuracy.

Constants match the gas and units, the denominator remains positive, and a single-phase equilibrium state is intended.

Use internally consistent units and retain extra precision when carrying the result into another calculation.

Reviewed reference factors

OpenStax Chemistry 2e

Van der Waals Gas Pressure Calculator

Calculation path

What you provide

What you receive

Choose the maximum decimal places shown. This does not increase source accuracy.

Reviewed reference factors

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