What is Thermal Expansion?

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What is Thermal Expansion?
« on: June 19, 2015, 12:13:21 PM »
Thermal Expansion: In general bodies undergo change in size when they are heated. This change in size on heating is termed Thermal Expansion.
Solids, when heated show increase in length, area or volume. Whereas liquids and gases expand in volume.
The property of thermal expansion varies from substance to substance. when solid is heated, its molecules vibrate more energetically against the action of inter molecular forces producing greater displacement.