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

- 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.

With that standard background, I think what you're asking is how to calculate the boiling point T

T

You can take it from there.

Mike W.

*(published on 06/07/2011)*

Q:

IS THERE ANY CALCULATION FOR BOILING POINT AGAINST VACUUM / NAGATIVE PRESSURE & PRESSURE

- snehal harishchandra patel (age 33)

surat

- 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.

Just type 17269 into the search box.

Mike W.

*(published on 04/27/2012)*