- A machine used to separate substances of different mass or different densities.

- The separating force is applied by centrifugal force.

- An example is a salad spinner, using centrifugal force to separate the heavier water from the lighter salad leaves.

A uranium centrifuge:

- Utilizes centrifugal force to enrich uranium, creating uranium-235.

- Uranium is a radioactive substance and an abundant element in the earth's crust.

- Uranium-235 is an unstable isotope of uranium, used as a fuel in nuclear reactors and some nuclear weapons.

- Uranium enrichment increases the concentration of uranium-235 relative to uranium-238.

- The process allows the separation of uranium isotopes.