What is meant by the term "density"? Please provide an example of how density is determined in air masses.

1) density "the degree of compactness of a substance."

2) air masses "More dense, or “heavier” air will slow down objects moving through it more because the object has to, in effect, shove aside more or heavier molecules. Such air resistance is called “drag,” which increases with air density."

Explanation:

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