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

a constant (atm*L2/mol2)

Required number input.

Moles

Required number input.

Volume (L)

Required number input.

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

Correction pressure (atm)

The resulting correction pressure 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 B Calculator

  Compute excluded volume n*b from van der Waals constant b.

• Van der Waals Pressure Correction Calculator

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

• DLVO Interaction Energy Estimate

  Combine a user-specified exponentially screened electrostatic repulsion with the non-retarded sphere–plate van der Waals term −AR/(6h). This is a simplified DLVO energy model, not a stability verdict for arbitrary colloids.