Discussion
Which ratio does the symbol epsilon denote in moist thermodynamics?
Answer: D
The constant epsilon equals 18.016 divided by 28.97, or about 0.622, and it converts between vapour pressure and mixing ratio in every moist thermodynamic formula. It is also the ratio of the dry air gas constant to the water vapour gas constant. The ratio of specific heats is conventionally denoted gamma, and the ratio of vapour pressure to total pressure is the mole fraction rather than a fixed constant. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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