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Look at the Clausius/Clapeyron equation:
DeltaH = - R* d(ln (Psat))/d(1/T)
it reduces to:
Ln(Psat2/Psat1) = -DeltaH/R*(1/T2 - 1/T1)
finally:
Psat2 = Psat1*exp(-DeltaH/R*(1/T2 - 1/T1))
DeltaH is the heat of evaporation (assume it's constant)
R is the ideal gas constant
T is absolute temperature
Psat is the vapor pressure
make Psat1 and T1 be the vapor pressure you know at the temp you know
Last edited by kutulu; 06-04-2004 at 09:16 AM..
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