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Derivation of Adiabatic Lapse Rate

  1. Jun 20, 2012 #1
    In the derivation of the adiabatic lapse rate, upon using the 1st law of thermodynamics: Why is potential energy neglected? The parcel of air is doing work PdV which is balanced by the internal energy term, cvdT.

    I can't think of a reason to neglect gravitational potential energy here.

  2. jcsd
  3. Jun 22, 2012 #2


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    The gravitational potential energy appears through the pressure P(z) because of the hydrostatic condition.
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