Discussion
Which form does the equation of state take for moist air?
Answer: C
Using virtual temperature allows the constant 287 to be retained for all moist air, which is why the device was invented. The alternative of a humidity dependent gas constant is mathematically equivalent but far less convenient. Dalton's law is of course also true, and it is the starting point from which the virtual temperature formulation is derived rather than an alternative to it. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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