Placed in centrifuges, these glass or plastic tubes can hold samples while rotating at very high velocity without spilling them. Also known as centrifuge vials, you can use them to segregate solids from liquid biochemical solutions. They look a lot like mini test tubes owing to their tapered bottom.
Scientists often use centrifuge tubes for separating solids, liquids, and gases, depending on their density. You can separate solid particles from liquids such as plasma and blood cells. You can do it by spinning centrifuge vials carrying the material at a very high speed. It allows the centrifugal force to push heavier materials to the bottom of the tubes.