### Topic Content:

- Definition of Linear Expansivity
- Calculations on Linear Expansivity

Expansivity is the increase in the length of a substance when its temperature increases by one kelvin or degree Celsius.

**Linear expansivity** (α) of a substance is defined as the increase in length of a substance, per unit length of the substance, per degree rise in temperature.

Mathematically,

linear expansivity = α

\(\scriptsize α = \normalsize \frac {Change \: in \: Length}{Original \: Length \: \times \: temperature \: rise}\)

If L_{1} = the original or initial length

θ_{1} = Original or initial temperature

L_{2 } = New Length

θ_{2} = New temperature

α = Linear expansivity

\( \scriptsize Then \; α = \normalsize \frac {L_2\: – \:L_1}{L_1 \: \times \: (\theta_2\: – \: \theta_1\ ) }\)

The S.I unit is per kelvin \( \scriptsize K^{-1} \) or per degree Celsius \( \scriptsize ^{०} C^{-1} \)

For a change in length,

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very easy to understand with this explanation

This was very helpful. Thanks a ton.

Very easy to understand

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