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# 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 = A0 γ (t1 - t0)                                 (1)

where

dA = change in area (m2)

A0 = initial area (m2)

γ = superficial expansion coefficient (m2/m2K)

t0 = initial temperature (oC)

t1 = final temperature (oC)

### Online Superficial Thermal Expansion Calculator

A0 - initial area (m2)

γ - superficial expansion coefficient (m2/m2K)

t0 - initial temperature (oC)

t1 - final temperature (oC)

Change in area (dA): (m2)

Final Area (A1): (m2)

In general the superficial temperature coefficients can be approximated to

γ  ~= 2 α

where

α =  linear temperature expansion coefficient (m/m K, m/m oC)

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

• aluminum : 0.000023 (m/m oC)
• steel: 0.000016 (m/m oC)
• copper: 0.000017 (m/m oC)

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Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

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