Question

What do you understand by thermal expansion

Answer 1

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$<b>The phenomenon of increase / decrease in size/volume due to heating/cooling is known as the phenomenon of thermal expansion.$

There are three types of thermal expansions.

#1•Linear expansion

#2•Superficial expansion

#3•Volumetric expansion

Answer 2

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Here is your answer...

Thermal expansion occurs when an object expands and becomes larger due to a change in the object's temperature. 

Temperature is the average kinetic (or movement) energy of the molecules in a substance.

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