Spherical dust particles of $50 \mu \mathrm{m}$ are settling under gravity in air at $21^{\circ} \mathrm{C}$ and normal atmospheric pressure. Density of particles is $1250 \mathrm{~kg} \mathrm{~m}^{-3}$ and density of air is $1.2 \mathrm{~kg} \mathrm{~m}^{-3}$. Considering viscosity of air as $1.81 \times 10^{-5}$ Pa s, the settling velocity of dust in $\mathrm{mm} \mathrm{s}^{-1}$ will be________________

Spherical dust particles of $50 \mu \mathrm{m}$ are settling under gravity in air at $21^{\circ} \mathrm{C}$ and normal atmospheric pressure. Density of particles is $1250 \mathrm{~kg} \mathrm{~m}^{-3}$ and density of air is $1.2 \mathrm{~kg} \mathrm{~m}^{-3}$. Considering viscosity of air as $1.81 \times 10^{-5}$ Pa s, the settling velocity of dust in $\mathrm{mm} \mathrm{s}^{-1}$ will be________________

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