1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: What is Maxwell's Principle (Thermodynamics)?

  1. Dec 19, 2011 #1
    1. The problem statement, all variables and given/known data

    I'm trying to calculate the saturation pressure and the densities of a liquid and vapor using an equation of state. I figured out how to do it and know how to proceed except that I don't understand Maxwell's Principle which is stated in number 2 below.

    2. Relevant equations

    ∫P.dV - Psat (Vg - Vl) = 0
    integration limits of the ∫P.dV are from Vl to Vg

    Where P is the pressure,
    Psat is the saturation pressure,
    Vg is the gas volume,
    Vl is the liquid volume

    3. The attempt at a solution

    I don't understand how principle is derived. The only equation which comes to mind that relates Pressure and Saturation Pressure is Raoult's Law which is y*P=x*Psat (y is the gas mole fraction and x is the liquid mole fraction).

    I would also appreciate it if I can be guided to some references which explains this prinicple, the book lacks this principle.
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted