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where: is thermal conductivity (SI units: watts per metre-kelvin, W∙m-1∙K-1) is the volumetric heat capacity (density kg∙m-3 times specific heat capacity J∙kg-1K-1; SI units: joules per cubic metre-kelvin, J∙m-3∙K-1)
Substances with high thermal diffusivity rapidly adjust their temperature to that of their surroundings, because they conduct heat quickly in comparison to their thermal 'bulk'.
For common rock material, ~ 10-6 m2∙s-1.
Thermal diffusivity of air at 300 K is 0.000024 m2/s.
For a plot of thermal diffusivity of air as a function of absolute temperature see James Ierardi's Fire Protection Engineering Site
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Thermal_diffusivity". A list of authors is available in Wikipedia.|