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
Famous quotes containing the words estimating, pressures, antoine and/or equation:
“I am sure that in estimating every man’s value either in private or public life, a pure integrity is the quality we take first into calculation, and that learning and talents are only the second.”
—Thomas Jefferson (1743–1826)
“The pressures of being a parent are equal to any pressure on earth. To be a conscious parent, and really look to that little being’s mental and physical health, is a responsibility which most of us, including me, avoid most of the time because it’s too hard.”
—John Lennon (1940–1980)
“And then I met a woman—now comes the funny
part—
With eyes that petrified my brain, and sunk into my heart.”
—Hugh Antoine D’Arcy (1843–1925)
“A nation fights well in proportion to the amount of men and materials it has. And the other equation is that the individual soldier in that army is a more effective soldier the poorer his standard of living has been in the past.”
—Norman Mailer (b. 1923)