# Volumetric - Cubic - Thermal Expansion

## Cubical expansion when changing temperature - online calculator

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Specific volume of a unit can be expressed as

v = 1 / ρ = V / m (1)

where

v = specific volume (m^{3}/kg)

ρ = density (kg/m^{3})

V = volume of unit (m^{3})

m = mass of unit (kg)

The change in the units volume when temperature change can be expressed as

dV = V_{0}β (t_{1 }- t_{0}) (2)

where

dV = V_{1}- V_{0}= change in volume (m^{3})

β = volumetric temperature expansion coefficient (m^{3}/m^{3 o}C)

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

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

The density of a fluid when the temperature is changed can be expressed as

ρ_{1}= m / V_{0}(1 + β (t_{1}- t_{0}))

= ρ_{0}/ (1 + β (t_{1}- t_{0})) (3)

where

ρ_{1}= final density (kg/m^{3})

ρ_{0}= initial density (kg/m^{3})

### Online Thermal Cubic Expansion Calculator

Be aware that the expansion coefficent for some liquids - like water - may vary with temperature.

### Volumetric Temperature Coefficients - *β *-* of some common Fluids *

- water at
*0*:^{o}C*-5**0 (1/*^{o}C) - water at
*4*:^{o}C*0 (1/*^{o}C) - water at
*10*:^{o}C*0.000088 (1/*^{o}C) - water at
*20*:^{o}C*0.000207 (1/*^{o}C) *water at**30*:^{o}C*0.000303 (1/*^{o}C)*water at**40*:^{o}C*0.000385 (1/*^{o}C)*water at**50*:^{o}C*0.000457 (1/*^{o}C)*water at**60*:^{o}C*0.000522 (1/*^{o}C)*water at**70*:^{o}C*0.000582 (1/*^{o}C)*water at**80*:^{o}C*0.000640 (1/*^{o}C)*water at**90*:^{o}C*0.000695 (1/*^{o}C)- ethyl alcohol :
*0.00109 (1/*^{ o}C), 0.00061 (1/^{o}F) - oil :
*0.00070 (1/*^{o}C), 0.00039 (1/^{o}F)

### Example - Cubic Expansion of Oil

*100 liters* - *0.1 m ^{3} *- of oil is heated from

*20*to

^{o}C*40*. The volumetric expansion can be calculated using equation

^{o}C*(2)*

*dV = (0.1 m ^{3})_{ }(0.00070 1/^{o}C) ((40 ^{o}C) - (20 ^{o}C)) *

* = 0.0014 m ^{3}*

* = 1.4 liter*

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