Ice, liquid water, and the gaseous water in stream are allmade up of the same water molecules. Yet they look and behave differently.
Solids have a definite volume and shape:
The particles in a solid are in fixed positions and are close together. Although the particles vibrate, they cannot move. As a result, a solid cannot easily change in shape or volume. If you force the particles apart, you can change the shape of a solid by breaking it into pieces. However, each of those pieces will still be a solid and have its own definite shape.
Liquids have a definite volume but can change shape:
Like water, all liquids have a definite volume but no definite shape. The particles in a liquid are close together, but they are not tightly attached to one another. Particles in liquids can slide past one another. As a result, liquids can flow.
Gases can change in volume and shape:
Gases do not have a definite volume or shape. The particles in a gas are very far apart. The amount of space between the particles in a gas can change easily.
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