Calculates the vapor pressure of a substance at a given temperature using the Clausius-Clapeyron equation. This calculator helps explore phase transitions and thermodynamics.
Start with your values, or try a preset.
Enter Initial Vapor Pressure (P1), Initial Temperature (T1), Final Temperature (T2), and Enthalpy of Vaporization (螖Hvap) in the units shown.
Read Enthalpy of Vaporization (螖Hvap), Gas Constant (R), and Final Vapor Pressure (P2) in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Initial Vapor Pressure (P1): 101.3 kPa; Initial Temperature (T1): 298.15 K; Final Temperature (T2): 373.15 K; Enthalpy of Vaporization (螖Hvap): 40.7 kJ/mol
Enthalpy of Vaporization (螖Hvap): 40,700 J/mol; Gas Constant (R): 8.314 J/(mol路K); Final Vapor Pressure (P2): 2,746.791097 kPa
Initial Vapor Pressure (P1): 5.95 kPa; Initial Temperature (T1): 293.15 K; Final Temperature (T2): 351.44 K; Enthalpy of Vaporization (螖Hvap): 38.6 kJ/mol
Enthalpy of Vaporization (螖Hvap): 38,600 J/mol; Gas Constant (R): 8.314 J/(mol路K); Final Vapor Pressure (P2): 82.2868108 kPa
Initial Vapor Pressure (P1): 12.7 kPa; Initial Temperature (T1): 293.15 K; Final Temperature (T2): 337.85 K; Enthalpy of Vaporization (螖Hvap): 35.3 kJ/mol
Enthalpy of Vaporization (螖Hvap): 35,300 J/mol; Gas Constant (R): 8.314 J/(mol路K); Final Vapor Pressure (P2): 86.30430083 kPa
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