Estimating Vapor Pressures With Antoine Equation
The Antoine equation is a mathematical expression of the relation between the vapor pressure and the temperature of pure liquid or solid substances. The basic form of the equation is:
and it can be transformed into this temperature-explicit form:
where: is the absolute vapor pressure of a substance
- is the temperature of the substance
- , and are substance-specific coefficients (i.e., constants or parameters)
- is typically either or
A simpler form of the equation with only two coefficients is sometimes used:
which can be transformed to:
Sublimations and vaporizations of the same substance have separate sets of Antoine coefficients, as do components in mixtures. The Antoine equation is accurate to a few percent for most volatile substances (with vapor pressures over 10 Torr).
Read more about this topic: Vapor Pressure
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