BrownianMotion is the random movement of particles in a liquid caused by constant collisions with the fast-moving molecules of the containing liquid.

The Particle Metrix Zeta View uses this principle to calculate hydrodynamic particle size by analysing short video clips of particles moving in a liquid under Brownian Motion.

The ZetaView® software analyses video clips to calculate the mean square displacement. The Stokes-Einstein equation is then applied to calculate hydrodynamic particle size.