# Thermal Expansion - Superficial i.e. Area

## Superficial i.e area temperature expansion - online calculator

The amount by which unit area of a material increases when the temperature is raised by one degree is called the coefficient of superficial (i.e. area) expansion. Superficial thermal expansion can be expressed as

dA = A_{0}γ (t_{1}- t_{0}) (1)

where

dA = change in area (m^{2})

A_{0}= initial area (m^{2})

γ = superficial expansion coefficient (m^{2}/m^{2}K)

t_{0}= initial temperature (^{o}C)

t_{1}= final temperature (^{o}C)

### Online Superficial Thermal Expansion Calculator

In general the superficial temperature coefficients can be approximated to

γ ~= 2 α

where

α = linear temperature expansion coefficient (m/m K,m/m)^{o}C

#### Linear Temperature Coefficients - *α *-* of some common metals *

- aluminum :
*0.000023 (m/m*^{ o}C) - steel:
*0.000016 (m/m*^{ o}C) - copper:
*0.000017 (m/m*^{ o}C)

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