Stokes’s law finds application in a number of areas, generally with regards to the settling of sediment in clean water and in measurements in the viscosity of parachute.
Falling of rain drops: When the water drops are small in size, their terminal velocities are small. Therefore they remain suspended in air in the form of clouds.
But as the drops combine and grow in size, their terminal velocities increases because, v ∞ a2. Hence they start falling as rain.
Come down from parachute: The Stoke’s law helps a person coming down by making use of a parachute, to reduce.
Stoke’s law explains why the speed of a raindrop is below a freely dropping body with continuous velocity, from the height of clouds.