Question

State the formula of coefficient of areal expansion ?​

Answer 1

Explanation:

Key Points

The area thermal expansion coefficient relates the change in a material’s area dimensions to a change in temperature. It is defined as

αA=1AdAdT.

The relationship between the area and linear thermal expansion coefficient is given as the following:

αA=2αL.

Just like the linear expansion coefficient, the area thermal expansion coefficient works as an approximation over a narrow temperature interval only.

Key Terms

linear thermal expansion coefficient: The fractional change in length per degree of temperature change.