Read the text.

Filtration and centrifugation are two techniques used to separate different materials from a mixture. Filtration involves straining unwanted materials, sometimes with the help of gravity. For example, you can pour a liquid mixture through a funnel lined with filter paper that collects unwanted solids.

Centrifugation, on the other hand, uses centrifugal force to separate materials. For example, vials of mixtures can be placed at an angle in special machines that spin at high speed. The spinning causes denser substances to move and collect at the bottom of the vial.