Michael has a substance that he puts into 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

The material is in the gaseous phase. It is very simple to understand. If we look into the basic properties of material it is easy to understand that gas can take up the volume of container in which it is kept. It does not have its own volume, while the solid and liquid phase of any material have a fixed volume.