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Thermal diffusivity

In heat transfer analysis, thermal diffusivity is the ratio of thermal conductivity to heat capacity.

$\alpha = {k \over {\rho c_p}}$

where k is thermal conductivity and ρcp is heat capacity. Units are m²/s.

Substances with high α will rapidly adjust their temperature to that of surroundings, because they conduct heat quickly in comparison to their thermal 'bulk'.

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