Thermal Expansion || for Class 11 in HINDI 

In this Physics video in Hindi we explained the thermal expansion and we discussed about different coefficients of thermal expansions, viz., coefficients of linear expansion, coefficients of area expansion and coefficients of volume expansion.
Thermal Expansion : When a body is heated, it expands. This phenomenon is known as thermal expansion.
When we give heat energy to a body, its atoms starts vibrating vigorously, resulting in the need of more space and hence the body expands.
Coefficients of thermal expansion : The part by which the body expands for unit change in temperature, is known as coefficients of thermal expansion.
Values of coefficient of linear expansion for some materials:
values are in 10^(-5) K^(-1)
Aluminium 2.5
Brass 1.8
Iron 1.2
Copper 1.7
Silver 1.9
Gold 1.4
Glass (pyrex) 0.32
Lead 0.29
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