Chemistry / Unit 8 Chem 1424 short lesson, about 20 seconds
The Clausius-Clapeyron Relation
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The idea
The Clausius-Clapeyron equation relates a liquid's vapor pressure to its kelvin temperature and enthalpy of vaporization, plotting as a line in logarithmic form.
In practice
Vapor pressures at two different temperatures are enough to calculate a liquid's enthalpy of vaporization from this one relationship.
Where people slip
Temperature must enter in kelvin — using Celsius produces a result with no physical meaning.
Your place on the trail
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