Discussion
Which quantity is the mass of water vapour per unit mass of dry air?
Answer: C
The mixing ratio is defined per unit mass of dry air, while specific humidity is defined per unit mass of moist air, so the two differ by a factor of one plus the mixing ratio. Since the mixing ratio rarely exceeds 0.04, the two are numerically close and the distinction is often ignored in practice. Absolute humidity is the mass of vapour per unit volume and is rarely used because it changes with pressure. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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