What materials can flow to fit containers?

Materials that can flow to fit containers include liquids, gases, and granular solids. Liquids, such as water and oils, take the shape of their containers due to their ability to flow easily. Gases, like air and steam, also expand to fill the entire volume of a container. Granular solids, such as sand and sugar, can flow to some extent when poured, allowing them to conform to the shape of a container as well.