Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

b constant (L/mol)

Required number input.

Moles

Required number input.

Compute excluded volume n*b from van der Waals constant b. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Excluded volume (L)

The resulting excluded volume returned as a number.

• Simple gas relationships often assume equilibrium and ideal-gas behavior. High pressure, low temperature, condensation, composition changes, and nonzero compressibility can require a real-gas equation of state.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Real Gas Correction A Calculator

  Compute van der Waals pressure correction term a(n/V)^2.

• Van der Waals Volume Correction Calculator

  Compute the excluded volume n·b subtracted from container size in the van der Waals equation.

• Van der Waals Pressure Correction Calculator

  Compute the corrected pressure from the van der Waals equation P = nRT/(V−nb) − a(n/V)².