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!

What is Enthalpy Conceptually?

  1. Feb 6, 2016 #1
    So I understand that enthalpy is energy. But what energy specifically? Is enthalpy heat energy? Is it the energy that bonds atoms together and that's why it can either be released or absorbed? Or is that what Gibbs free energy is?

    I'm trying to make sense of the equation:

    ΔG=ΔH-TΔS

    Conceptually, how is enthalpy different from Gibbs free energy?

    Thanks!
     
  2. jcsd
  3. Feb 6, 2016 #2
    Enthalpy is just a convenient parameter to work with in solving certain kinds of problems. It doesn't have a fundamental significance (in my judgment) like internal energy has. It is just H = U + PV, and this group arises often in many problems and analyses. My advice is not to spend too much of your valuable time trying to assign a fundamental physical significance to H. After you get some experience solving thermo problems, you will become much more comfortable with enthalpy.
     
  4. Feb 6, 2016 #3
    Fair enough. So then is there a way to conceptually explain ΔG=ΔH-TΔS? Or is that not really possible?
     
  5. Feb 6, 2016 #4
    G is another useful function that comes into play in many types of problems. It too is difficult to assign physical significance to. The more fundamental thermodynamic properties, internal energy U and entropy S, can be assigned physical significance.

    Chet
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: What is Enthalpy Conceptually?
  1. Specific Enthalpy (Replies: 1)

  2. Enthalpy is useless? (Replies: 3)

  3. Enthalpy & entropy (Replies: 4)

Loading...