A centrifuge is a machine that uses centrifugal force to separate components in a mixture of liquid and solid particles or liquid and liquid. Centrifuges are mainly used to separate solid particles in suspension from liquids, or to separate two immiscible liquids of different densities in an emulsion (e.g. separating cream from milk); It can also be used to remove liquids from wet solids, such as using a washing machine to dry wet clothes; The special superspeed tube separator also separates gas mixtures of different densities; Taking advantage of the different sedimentation rates of solid particles of different densities or particle sizes in liquids, some sedimentation centrifuges can also classify solid particles according to density or particle size.