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? solid or liquid liquid or gas liquid gas

Answer is: gas.

This substance changes volume and that is characteristic of gases.

In solid, molecules are closely packed, stiff and do not changes of shape or volume. Solid object (for example wood) does not take on the shape of its container.  

Liquids (for example water) have definite volume, but no fixed shape.  

Gases (for example nitrogen and neeon) not have definite volume and fixed shape, it depends on its container.  

the temperature of the gas, in k, not celsius.