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Which quantity is unchanged when a parcel is heated at constant pressure?

  • A.The potential temperature, which is conserved because the parcel remains at the same level throughout the heating
  • B.The temperature
  • C.The relative humidity, since neither water has been added nor removed during the heating of the parcel
  • D.The pressure and the mixing ratio

Answer: D

Isobaric heating raises both the temperature and the potential temperature while leaving the pressure and the water content unchanged. Relative humidity falls because the saturation value rises. This is the case that separates diabatic from adiabatic processes most clearly, since the potential temperature changes only when heat is actually added.

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