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Example ; oil , water , milk .

Gas : -.

- it has indefinite shape and indefinite volume .

( take the shape and the volume of their container )
Example : oxygen , water vapour .

Changes of matter:

- Matter exists in only one state at the ordinary room temperature.

- Matter can be changed from one state to another by heating or

cooling.

Melting : it is the change in a matter state from solid to liquid by

heating .
Evaporation : it is the change in a matter state from liquid to gas by

heating.

Condensation : it is the change in a matter state from gas to liquid by

cooling

Freezing : it is the change in matter state from liquid to solid by
cooling .

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