// multi-utility computation suite · offline · instant · precise
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sci.heat-of-vaporization Calculator
Calculates enthalpy of vaporisation from vapour pressure measurements at two temperatures using the Clausius-Clapeyron equation. For water, ΔH_vap = 44 kJ/mol at 25 °C — this high value (due to hydrogen bonding) gives water its unusually large temperature-stabilising effect in climate.
Inputs
Clapeyron-Temp1 C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Clapeyron-Pressure1 Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Clapeyron-Temp2 C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Clapeyron-Pressure2 Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Results
ΔH_vap (J/mol)
Reference formula or conversion factor shown for context.
ΔH_vap (kJ/mol)
Reference formula or conversion factor shown for context.