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In heat transfer analysis, thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure. It measures the rate of transfer of heat of a material from the hot end to the cold end. It has the SI derived unit of m/s. Thermal diffusivity is usually denoted α but a, h, κ , K, and D are also used.
The formula is:
where
Together, ρ c p {\displaystyle \rho c_{p}\,} can be considered the volumetric heat capacity ].
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