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Absolute humidity of moist air is normally defined as the

  • A.mass of water vapour per unit mass of dry air
  • B.mass of water vapour per unit mass of moist air
  • C.volume of water vapour per unit volume of air
  • D.partial pressure of the water vapour

Answer: A

Using dry air as the denominator gives a quantity that does not change when water is added or removed, which is exactly what a drying calculation needs. The moist air basis changes with every addition and is much less convenient.

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