By: Stanley

Particle Model

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Particles in the three states of matter

There are 3 states of matter:

1.Solid

2.Liquid

3.Gas

Solids

In solids, strong forces hold the particles together in a three–dimensional structure. They have a very tiny room so they still vibrate.

The particles in a solid

LiquidsIn liquids, the forces that hold the particles together are weaker than I solids. In liquids, the particles can slide pass each other.

The particles in liquid

Gases

In gases, the forces of attraction netween the particles are very small and the particles can move away from each other and travel in all direction. It has a really big space in gas.

The particles in gas

When a solid is heated it expands and when is cools is contracts. For example, when it is cool a metal bar fits inside a metal gauge. Its end will also fit through the hole in the gauge. When the bar has been heated it will no longer fit in the gauge or in the hole. When the bar cools down it will fit in the gauge and hole again.

How materials change with temperature

When liquids are heated they generally expand much more than solids for a given temperature rise. They also contract to their original volume when they are cooled. However, water has a strange property – as it is cooled it expands again when its temperature drops below 4˚C and continue to expand until it reaches O˚C.

Changes in liquids

Like most liquids and solids, gases expand when they are heated and contract when they are cooled. If a gas and a liquid undergo the same temperature rise the gas expands about ten times more than liquid.

Changes in gases

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