// multi-utility computation suite · offline · instant · precise
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sci.clausius-clapeyron Calculator
Calculates the vapour pressure as a function of temperature using the Clausius–Clapeyron equation: d(ln P)/d(1/T) = −ΔH_vap/R. Water's boiling point drops to 70 °C at 31 kPa (mountain altitude ~9,000 m) — the equation quantifies why pressure cookers raise boiling point above 100 °C.
Inputs
Vapor Pressure1 Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Temperature1 K
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Temperature2 K
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Enthalpy Vap Kj Mol
Reference formula or conversion factor shown for context.
Results
vapor pressure P₂ (kPa)
Reference formula or conversion factor shown for context.
P₂/P₁ ratio
The proportional relationship between two quantities.
ln(P₂/P₁) = -ΔHvap/R × (1/T₂-1/T₁)
Sample size or count used in the calculation.
T₁
Reference formula or conversion factor shown for context.
T₂
Reference formula or conversion factor shown for context.