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Which quantity accounts for that latent heat in its definition?

  • A.Potential temperature, which already includes the contribution of the water vapour through the specific heat
  • B.Equivalent potential temperature
  • C.Virtual temperature, which accounts for the effect of the water vapour upon the density of the air parcel
  • D.Wet bulb temperature

Answer: B

Equivalent potential temperature is what a parcel would have if all its vapour were condensed and the released heat retained, then brought adiabatically to the reference pressure. It is therefore conserved for both dry and saturated adiabatic motion. Virtual temperature is a density correction and answers a quite different question about the same parcel.

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