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This International Standard describes the application of photon correlation spectroscopy (PCS) to the measurment of an average particle size and a measure of the broadness of the size distribution of particles dispersed in liquids. It is applicable for particle sizes ranging from a few nanometres 1um, or to the onset of sedimentation. In the data analysis procedure (see annexes A and C) it is assumed that the particles are isotropic and sperhically shaped. NOTE 1 - the technique is also known or referred to under other names, e.g quasi-elastic light scattering (QELS) and dynamic light scattering (DLS).