the solid substance that spins to the bottom of the tube with a successful centrifugation is called the

A centrifuge is a device, generally driven by an electric motor, that puts an object, e.g., a rotor, in a rotational movement around a fixed axis. ... Here, particles are concentrated as a pellet at the bottom of the centrifuge tube and separated from the remaining solution, called supernatant.

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po-215 i got it right on the quiz

there are two significant figures.