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Q:
Dear Sir/madam,
Iam not clear with the Clausius Clapeyron equation to calculate the boiling point of liquid with high vaccum. the formula which I found is given below.
please illustrate with the coulpe of examples based on the below mention formula.Awaiting for your reply.
Clausius Clapeyron:
ln (P2 / P1) = (Hvap / R)( (1/T1) - (1/T2) .
In the equation, P1 is the vapor pressure at some known temperature and pressure -- such as atmospheric pressure -- and T1 is the corresponding temperature.
P2 is the new pressure once vacuum is applied,
R is a constant, and
Hvap is the amount of heat energy needed to evaporate a given amount of the liquid.
- DINESH (age 22)
INDIA
A:
Let's say that you know the boiling point T
1 when P
1=1 atm. You probably can also look up the (approximately constant) latent heat, H, and of course have the universal gas constant, R.
With that standard background, I think what you're asking is how to calculate the boiling point T
2 for some very low pressure P
2. Well, let's just solve for T
2.
T
2 = T
1/ (1+(HT
1/R*ln(1atm/P
2))).
You can take it from there.
Mike W.
(published on 06/07/2011)
Follow-Up #1: water boiling temperature vs. pressure
Q:
IS THERE ANY CALCULATION FOR BOILING POINT AGAINST VACUUM / NAGATIVE PRESSURE & PRESSURE
- snehal harishchandra patel (age 33)
surat
A:
Check the preceding answer (17269) and its follow up if you need more explanation.
Just type 17269 into the search box.
Mike W.
(published on 05/01/12)
Follow-up on this answer.
