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# States of Matter

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 Sub Topics Matter is all around you. It is every where you look. The TV on your desk, your favorite soda, the air you breathe, and your pet hamster are made up of matter. Scientists use the word matter to mean anything that takes up space. One way to describe matter is by its state, or form. In this section we will learn more about different states of matter. There are three main states of matter on earth. They are: Solid stateLiquid stateGas state

## Solid State

Solid under ordinary conditions ordinary conditions have definite volume and shape and tend to maintain these even under deforming forces. One can see and feel the shape of the solid. One can also describe how solids looks and how it feels.

In a solid atoms, ions and molecules are most tightly packed and the inter molecular force of attraction between the constituent particle are strong. As a result the particles do not have any freedom of motion that is the particle are fixed in their position.

The characteristic properties of solid are:
1. A definite shape and volume
2. In-compressibility
3. Rigidity
4. No fluidity

## Liquid State

Liquids have definite volume but do not poses definite shape. They can take the shape of the containers in which they are placed. This state is the intermediate state of solid state and gaseous state. The water, milk etc., are example of liquid state.

The arrangement of constituents of liquid have neither the orderly arrangement as the constituents of solid nor the complete disorder as in gases. It is observed that some of the properties of liquids approach those of solids while some of the properties closely resemble those of gases.
The position of the molecules in liquids are not rigidly fixed. But the molecules in a liquid state have much shorter mean free path as compared to gas molecules.

## Gaseous State

The gases will not maintain the volume and shape, and gases will completely fill the container in which they are introduced.

The characteristic properties of gases are:
1. Gases are highly compressible:
2. All gases, except few are colourless.
3. It expand considerably on heating.