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Enthalpy creates a system?

  1. Jul 4, 2011 #1
    Hi, i was studying about enthalpy earlier and found its definition to be confusing

    "Enthalpy is a measure of the total energy of a thermodynamic system. It includes the internal energy, which is the energy required to create a system, and the amount of energy required to make room for it by displacing its environment and establishing its volume and pressure. "

    i dont understand the italicized part...how can internal energy create a system?? :confused:
     
  2. jcsd
  3. Jul 4, 2011 #2
    Hello boobybobble, welcome to Physics Forums.

    Your definition of enthalpy was a bit unusual, where did it come from?

    In respect of your actual question this probably refers to the use of enthalpy in chemistry where there is a standard enthalpy of formation for every substance.
    This is the energy required to combine the various constituent elements to form the substance.

    http://en.wikipedia.org/wiki/Standard_enthalpy_of_formation

    go well
     
  4. Jul 5, 2011 #3
    thanks Studiot :smile:

    http://en.wikipedia.org/wiki/Enthalpy -->thats where i got the definition from

    As for the link you posted, it elaborates on "enthalpy of formation", which is something like enthalpy of -evaporation condensation and blah blah...but i'm talking about the entity enthalpy itself, which is pretty confusing given the definition in wikipedia and a lot of other websites(and my book too).
     
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