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The humidity ratio of moist air is defined as

  • A.The mass of water vapour per unit mass of dry air
  • B.The mass of water vapour per unit mass of moist air
  • C.The partial pressure of vapour divided by atmospheric pressure
  • D.The vapour pressure divided by the saturation pressure

Answer: A

Expressing it against dry air gives a quantity that does not change when the air is heated or cooled without adding or removing moisture. That constancy is what makes the psychrometric chart so useful in following a drying process.

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