what is termal expansion
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hermal expansion is the tendency of matter to change its shape, area, and volume in response to a change in temperature.
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in simple words
1.any thing which expands on heating
2. expansion of matter on heating
3.most of solids liquids and gases are known to expand on heating this phenomenon is called thermal expansion.
Example:-the metal rim to be put on a cart wheel is designed to have a smaller diameter than that of the wheel when the cm is heated it becomes red hot expense and slips on to the will easily when it is cold it contracts and grapes the wheel firmly.
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