A substance seems to completely fill a container, but more can be forced in. Is the substance a solid, liguid, gas or none of these????

gas

Gas

Based on the information provided, it seems that the substance is a gas. This is because gases are highly compressible and can be forced into a container, even if it already appears to be filled.

To determine the nature of the substance, whether it is solid, liquid, gas, or none of these, we need to consider how it behaves when more of it can be forced into a container.

If a substance can fill a container completely but more can still be forced in, it typically indicates that the substance is a gas. Gases have the ability to expand and occupy the entire available volume, exerting pressure on the walls of the container. Even if the container appears to be completely filled, a gas can still compress further when additional gas is forced into it.

On the other hand, solids generally have a fixed shape and volume, and cannot be compressed to fit into a smaller space. They maintain their shape even if more is added, for example, think of filling sand into a jar. Liquids, although they can flow and take the shape of their container, have a fixed volume and cannot easily be compressed.

Therefore, based on the information provided, the substance that completely fills the container but more can still be forced in is most likely a gas.