Density describes how much mass is contained in a certain volume. Knowing how far apart molecules are in each state, which best ranks solids, liquids, and gasses from least dense to most dense?

Density is mass per unit volume. Gas molecules are much farther apart than molecules in liquids or solids, so gases are generally the least dense; solids are generally the most dense. Thus, the true statement is that gases are less dense than solids.

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