Derivation of Adiabatic Lapse Rate

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SUMMARY

The discussion centers on the derivation of the adiabatic lapse rate, specifically addressing the neglect of gravitational potential energy in the context of the first law of thermodynamics. It is established that the work done by a parcel of air, represented by PdV, is balanced by the internal energy change, cvdT. The gravitational potential energy is accounted for through the pressure P(z) due to the hydrostatic condition, which clarifies its role in the derivation.

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  • Understanding of the first law of thermodynamics
  • Knowledge of adiabatic processes in thermodynamics
  • Familiarity with hydrostatic pressure concepts
  • Basic principles of potential energy in fluid dynamics
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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.

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

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