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John C. has clearly stated the right answer.
Let me take a moment to analyze the *wrong* answer a little bit also.
I haven't made a scientific study of the abnormal psychology of moist air,
but my experiences tend to confirm Alvin's report : the wrong opinion is
widely and often strongly held.
1) Most people have no way of measuring the quantity physicists call
density, so for them the word is an abstract, almost metaphorical concept.
Density may be a metaphor for "resistance" --- in the sense that the
"sticky" summer air "resists" my efforts to run a marathon.