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Thermal Diffusivity

Applicable units are those of quantitykind:AreaPerTime

In heat transfer analysis, thermal diffusivity (usually denoted $\alpha$ but $a$, $\kappa$,$k$, and $D$ are also used) is the thermal conductivity divided by density and specific heat capacity at constant pressure. The formula is: $\alpha = {k \over {\rho c_p}}$, where k is thermal conductivity ($W/(\mu \cdot K)$), $\rho$ is density ($kg/m^{3}$), and $c_p$ is specific heat capacity ($\frac{J}{(kg \cdot K)}$) .The denominator $\rho c_p$, can be considered the volumetric heat capacity ($\frac{J}{(m^{3} \cdot K)}$).

http://dbpedia.org/resource/Thermal_diffusivity

http://en.wikipedia.org/wiki/Thermal_diffusivity

$a = \frac{\lambda}{\rho c_\rho}$, where $\lambda$ is thermal conductivity, $\rho$ is mass density and $c_\rho$ is specific heat capacity at constant pressure.

$\alpha$

a