A centrifuge is a machine that uses centrifugal force to separate the components of a mixture of liquid and solid particles, or liquid and liquid. Centrifuges are mainly used to separate solid particles from liquid in a suspension, or to separate two immiscible liquids with different densities in an emulsion (for example, separating cream from milk); they can also be used to remove liquid from wet solids, such as spinning wet clothes in a washing machine; special ultra-speed tubular separators can also separate gas mixtures with different densities; by utilizing the different settling velocities of solid particles with different densities or particle sizes in a liquid, some sedimentation centrifuges can also classify solid particles by density or particle size. A centrifuge is a machine that uses centrifugal force to accelerate the separation of different materials that need to be separated. Centrifuges are widely used in chemical, petroleum, food, pharmaceutical, mineral processing, coal, water treatment, and shipbuilding industries.