Question

What do you mean by superficial expansion? On what factors does it depends?

Answer 1

superficial expansion is the expansion of area

it depends on the material
amount of heat supplied

Answer 2

Superficial expansion and the factor on which it depends

Explanation:

• Superficial expansion is defined as the increase in surface area of the solid on heating.
• If you consider at $0^0 C$ area of a solid is $A_0$ then its area at $t^0 C$ is given by:                                       $A_0 (1+\beta t)$.
• Unit of β is $^0C^{ - 1}$ or$K^{-1}$ Where β is known as the coefficient of superficial expansion.

                                      $6\alpha = 3\beta = 2\gamma$

• The factor which causes expansion in matter is temperature. As the temperature increases the matter gets expanded.
• This is because the average kinetic energy increases hence molecules move inside the matter faster hence increases the volume.

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