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Relative humidity is the ratio of

  • A.the actual humidity of the air to unity itself
  • B.the wet bulb to the dry bulb temperature ratio
  • C.the water partial pressure to its saturation value
  • D.the mass of the water to the mass of the dry air

Answer: C

It is a pressure ratio expressed as a percentage and reaches a hundred at saturation. The second option defines absolute humidity, which is a quite different quantity with different units. Both are quoted as percentages, which invites the confusion.

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