Why would a solid like iron expand the least when heated, as compared to other materials like oil, and gas?

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Anonymous · Accepted Answer

It is directly related to the density of the material. Solids expand the least when heated because the molecules are most tightly packed. Conversely, gases expand the most because the molecules are not densely packed together.

Why would a solid like iron expand the least when heated, as compared to other materials like oil, and gas?

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