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State of change


A liquid readily changes its shape to suit the container but resists any change to its volume. A gas has no definite shape or volume and readily fills any container in which it is placed, but in doing so, changes its density.

Heat can change a material from one state to another:

SOLID – LIQUID – GAS

F – Fusion or melting

B – Ebullition or boiling

Cooling can reverse the process from one state to another.

GAS – LIQUID – SOLID

C – Condensing



S – Solidifying

Changes take place at definite temps. in a particular material but at different temps in different materials.



Pure water freezes at a temp. of 0°C or 273K. When exposed to normal atmospheric pressure. During solidification its volume increases slightly.


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