Stokes’ law Calculator

Stokes’ law states that the frictional force $F$ exerted on a spherical particle of radius $r$ moving through a viscous fluid with viscosity $\eta$ at a velocity $v$ is directly proportional to the velocity of the particle and the viscosity of the fluid and inversely proportional to the radius of the particle. Mathematically, it can be expressed as:

Where:

• $F$ is the drag force exerted on the particle,
• $\eta$ is the viscosity of the fluid,
• $r$ is the radius of the spherical particle, and
• $v$ is the velocity of the particle.