Discussion
Which value does the specific gas constant for water vapour take?
Answer: C
Water has a molecular mass of 18 grams per mole against 29 for dry air, so its specific gas constant is correspondingly larger at 461 joules per kilogram per kelvin. The ratio of the two constants, about 0.622, appears throughout moist thermodynamics and is worth committing to memory. The latent heat is a quite different quantity that happens to be numerically memorable.
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