Thermal diffusivity measures a material's ability to conduct thermal energy relative to its ability to store thermal energy, with the standard international (SI) unit of m2/s. It is calculated by dividing a material's thermal conductivity by the product of its specific heat capacity and density, providing a measure of how quickly a material responds to changes in temperature.

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THERMAL DIFFUSIVITY
It measures the ability of a material to conduct thermal
energy relative to its ability to store thermal energy.It
has the SI unit of m²/s. Thermal diffusivity is usually
denoted by α
The formula is:
α = k/(c x rho )
where
k is thermal conductivity (W/(m·K))
rho is density (kg/m³)
c is specific heat capacity (J/(kg·K))