Recent content by Proust

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    Isobaric evaporation, why the temperature must be constant?

    Homework Statement In case of an isobaric evaporation, why the temperature must be constant? Homework Equations I'm working on Mollier Diagram and my textbook says "because P is constant, so T is also constant", I coundn't understand it anyway The Attempt at a Solution
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    Why Is Reversibility Essential for Using dS=δQ/T?

    Homework Statement In my book it says, "only if the transformation is reversible can we use dS=\frac{\delta Q}{T}", but I don't know why? I think even if it's not reversible we also use \delta Q=TdS to solve the thermo problems, don't we? I'm looking forward to your ideas, thanks.
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    Two problems while reading Feynman lectures (vector field))

    Yes! And I'm still confused now!
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    Two problems while reading Feynman lectures (vector field))

    From which we can conclude A X (AT) = (A X A) T ?
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    Two problems while reading Feynman lectures (vector field))

    In fact I just can't understand why we have A X (AT) = (A X A) T Why the same form ...
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    Two problems while reading Feynman lectures (vector field))

    Question 1: solved! Question 2: Why it's zero? I think we cannot get zero unless it's an exact differential form? Many thanks.
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    Why Just 2 Variables for Equilibrium State?

    Hello, The textbook says to describe an equilibrium state we just need to know the number of moles and 2 variables which are intensives, but I just cannot understand why 2 variables? How to explain that? Thanks a lot.
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