Laser light scattering (LLS), including both angular dependence of the absolute scattering intensity (static LLS) and of the line-width distribution G(Gamma) (dynamic LLS), were used to characterize two kinds of pauci-chain polystyrene (PCPS) microlatices (latex-1 and latex-2). Each PCPS particle contains only a few linear uncrosslinked polystyrene chains. in static LLS, the weight-average particle molar mass (M(w)) was measured; and simultaneously in dynamic LLS, the diffusion coefficient distribution was obtained from Laplace inversion of precisely measured intensity-intensity time correlation function. Our results reveal that, on average, latex-1 and latex-2 contain similar to 13 and similar to 7 linear polystyrene chains, resp. A combination of both static and dynamic LLS results enables us to calculate the average density of PCPS. Our results have also shown. that the particle density of latex-1 and latex-2 are 0.90 and 0.80 g/cm(3), respectively, which are lower than the density of conventional polystyrene latex particles or bulk polystyrene. Our results imply that the particle density decreases as the average number of polystyrene chains inside the particles decreases.