What are three properties of matter?
One property of all matter, whether it's a solid, liquid, or gas, is that it takes up space and has mass.
Solids don't change shape easily.If you put a solid in a container it won't change its shape... No matter how much you move or slide it around. Think of an ice cube inside a cup. The cube is solid and it stays the same shape.
Solid particles don't move around.
Solid particles are in an aligned array.
Liquids take the shape of their container. If you pour milk into a glass it will take the shape of the glass. If you pour the milk into a bowl, it takes the shape of the bowl.
Liquids have surface tension. The particles hold on to each other, like holding hands with a friend. The skin or surface of a glass filled with water holds together because the particles hold one to each other. That is called surface tension.
Liquids move around. The particles in liquids are farther apart than those of solids, so they can move around more. That's why liquids take the shape of their container.
Gas is invisible. That means you can't see it. The particles are so far apart they are invisible, but they are still there! Think about oxygen. You can't see it, but you know it's there because you breath it.
Gas particles move around freely. They are spread out move fast, like when you are running on the playground at recess.