Centrifuge, a machine that separates liquids of different densities. It can also separate liquids from solids that are held in suspension. An example is the cream separator, used to break down whole milk into cream and skim milk. Centrifuges are also widely used in medical, chemical, and biological laboratories and have many industrial uses.

The liquid to be separated is placed in a container that is rotated at high speed. Because of centrifugal force, the heavier materials are thrown out farther from the center of rotation than are the lighter materials, thus separating them.