It is possible to find a simple centrifuge even in household, which is a salad spinner. It works according to a similar principle as the modern centrifuges in the laboratory. The salad spinner flings the salad at an appropriate speed to the walls of the drum and the present water is pressed out through the holes into a separate bowl.
In many industrial and laboratory technical situations it is necessary to separate from each other two or more components in suspensions, emulsions as well as in gaseous mixtures . As every component has got its own density, theoretically one just needs to wait till the gravity separates the mixture of substances itself (i.e. sediment in coffee, wine…) These processes can take a lot of time under different circumstances, especially when the difference in density between the components is small or other components make the material separation more difficult.