Thermal diffusivity of air is 18.46 mm2/s. Considering density of air as 1.2922 kg/m3, thermal conductivity of 0.024 W/m⋅K and specific heat of 1006 J/kg⋅K, the thermal diffusivity is calculated as α = 0.024 / (1.2922 × 1006) = 18.46 mm²/s. Read more