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

P1

Required number input.

T1

Required number input.

T2

Required number input.

dHvap

Required number input.

Compute P2 = P1 * exp[-dHvap/R * (1/T2 - 1/T1)]. 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]

P2

The resulting p2 returned as a number.

• Thermodynamic quantities are state- and temperature-dependent and must use consistent reference states and sign conventions. Heat loss, phase changes, non-ideal mixing, path-dependent work, and heat-capacity variation may need separate treatment.
• 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.

• Clausius–Clapeyron Vapor Pressure

  Estimate vapor pressure at a second absolute temperature from a reference pressure and molar enthalpy of vaporization using the integrated Clausius–Clapeyron equation. Assumes vapor behaves ideally and enthalpy stays constant over the temperature interval.

• Clausius Vapor Pressure At T

  Compute the vapor pressure at a second temperature from the Clausius-Clapeyron relation using a reference pressure and enthalpy of vaporization.

• Boiling Point Clausius-Clapeyron Calculator

  Solve for T2 from the Clausius-Clapeyron equation.