The stability of particles in solution can be quantified by measuring the Zeta potential of the particles. Zeta potential is the measurement of the electric potential at the slipping plane in the double layer surrounding a particle in liquid suspension. While not measured directly, Zeta potential can be calculated using theoretical models and measuring the electrophoretic mobility of the particles. An induced electric field causes charged particles in solution to move toward the electrode opposite their surface charge. The velocity of the charged particles moving toward the electrode is proportional to the amount of charge of the particle. Using Electrophoretic light scattering, the velocity of the particles can be determined by measuring the frequency shift of the light scattered by the particles in motion.