Warm air rises because it A. lacks density. B. has a higher density than cool air. C. has a lower density than cool air. D. is unaffected by pressure.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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