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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