martes, 30 de abril de 2013

How does particles motion affect the properties of solids, liquids and gases?

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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