Michael has a substance that he puts in Container 1. The substance has a volume of 5 cubic meters. He then puts the substance in Container 2, and it now has a volume of 10 cubic meters. In which phase(s) is the substance?

A gas expands to fill the volume of its container, so its volume can change when moved to a larger container. Solids and liquids have a definite volume and would remain at 5 cubic meters. The substance is therefore a gas, choice D.

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