The use of Stokes’ law for measurement of the size of

Solution

Stokes' law is used for the measurement of particle size in soil, and it relies on certain simplifying assumptions. These assumptions are: A. Particles must be spherical, smooth, and rigid: This assumption is necessary for the calculation of the drag force acting on the particles. B. Fall must be unhindered: Stokes' law assumes that the particles are freely falling through a liquid medium without any obstructions or interference from other particles. D. Size of particles must be small compared to the size of molecules of the liquid: This assumption ensures that the motion of the particles is primarily influenced by viscous drag forces rather than other forces, such as inertial forces.