What is thermal expansion ? Write only its types.
What is thermal expansion ? Write only its types.
It is our common experience that most substances expand on heating and contract on cooling. A change in the temperature of a body causes change in its dimensions. The increase in the dimensions of a body due to the increase in its temperature is called thermal expansion. There are three types of thermal expansion :
$(a)$ Linear expansion : The expansion in length is called Linear expansion.
$(b)$ Area expansion : The expansion in area is called Area expansion.
$(c)$ Volume expansion : The expansion in volume is called Volume expansion.
All are shown in the figure as below.
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