How will you be able to tell whether the material is a solid liquid or gas?

A stone wall is hard, water is wet, and the air is invisible. But they are all matter, and they are all made up of molecules. Even so, they behave in different ways. So we say that they are different forms of matter.

Stone is a solid. It has a shape of its own. The molecules in most solids are very close together. They pull hard on each other. This pull makes solids keep their shape.

Water is a liquid. It has no shape of its own. It takes the shape of the container it is in. Molecules in most liquids are further apart than molecules in a solid. They don’t pull as hard on one another. So the molecules of a liquid can slide around and take any shape.

Air is a gas. It has no shape of its own, either. Its molecules are so far apart that they hardly pull on one another at all. Molecules of a gas bounce around so easily that they can squeeze into a small balloon or spread out to fill a big room.

Picture Credit : Google