Exercise $1$ :

Drops of oil meter in diameter$)$ are to be settled from an air mixture $($atmospheric pressure, $21C).$ How high should the chamber be for a settling time of $1$ minute?

Data:

Density of particles $=899\mathrm{.}8k\frac{g}{m^3}$

Density of air $=1\mathrm{.}2k\frac{g}{m^3}$

Viscosity of air $=1\mathrm{.}8{10}^{-5}k\frac{g}{m}s$