Formula
This calculator uses the equation below. Use it as a quick reference when checking setup before solving.
ln(p2/p1) = -(delta_H_vap/R) * (1/t2 - 1/t1)Physical Chemistry
Clausius Clapeyron Calculator
Solve one variable in ln(p2/p1) = -(delta_H_vap/R) * (1/t2 - 1/t1) for phase-transition pressure-temperature changes.
ln(p2/p1) = -(delta_H_vap/R) * (1/t2 - 1/t1)
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Leave a nullable field blank to solve for it.
Variable glossary
P1 (p1)
Initial equilibrium pressure (must be > 0). Set to null to solve.
P2 (p2)
Final equilibrium pressure (must be > 0). Set to null to solve.
Delta H Vap (delta_h_vap)
Enthalpy of vaporization (J/mol). Set to null to solve.
T1 (t1)
Initial temperature in kelvin (K). Set to null to solve.
T2 (t2)
Final temperature in kelvin (K). Set to null to solve.
R (R)
Gas constant in J/(mol*K), default 8.31446261815324.
Frequently Asked Questions
What does the Clausius Clapeyron calculator solve?
It solves Clausius Clapeyron problems in physical chemistry using your provided inputs and computes unknown values when nullable fields are left blank.
Do I need to convert units before using this tool?
Use the unit toggles where available (for example K/C and L/mL). ChemGenius converts values to the calculator's base units automatically before solving.
Can I save this result in my workflow?
Yes. After computing a result, you can continue into ChemGenius workflows like protocol drafting or notes to keep your calculation context attached to downstream work.