Differentiate between the following: Expansion and Contraction.

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Solution

Expansion
Contraction.
Expansion is the increase in the size of an object on heating. Contraction is the decrease in the size of an object on cooling.
Example: Rise in level of mercury in mercury thermometer, on touching a hot object. Example: Lowering the level of mercury in mercury thermometer, on removing from a hot object.
In expansion, the energy of matter particles increases. In contraction, the energy of the matter particle decreases.
In expansion, the volume occupied by matter increases. In contraction, the volume occupied by matter decreases.

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Expansion	Contraction.
Expansion is the increase in the size of an object on heating.	Contraction is the decrease in the size of an object on cooling.
Example: Rise in level of mercury in mercury thermometer, on touching a hot object.	Example: Lowering the level of mercury in mercury thermometer, on removing from a hot object.
In expansion, the energy of matter particles increases.	In contraction, the energy of the matter particle decreases.
In expansion, the volume occupied by matter increases.	In contraction, the volume occupied by matter decreases.