Here's why:
* Gas: Gases have neither a definite volume nor a definite shape. They take the shape and volume of their container.
* Liquid: Liquids have a definite volume (meaning they take up a specific amount of space) but not a definite shape. They will flow and take the shape of their container.
* Solid: Solids have both a definite volume and a definite shape.
Think of it this way:
* Gas: Like air, it fills the entire room.
* Liquid: Like water, it takes the shape of a glass, but it always has the same volume.
* Solid: Like a rock, it has a fixed shape and size.
