A svedberg unit (symbol S, sometimes Sv) is a non-SI unit for sedimentation rate. The sedimentation rate for a particle of a given size and shape measures how fast the particle 'settles', or sediments. It is often used to reflect the rate at which a molecule travels to the bottom of a test tube under the centrifugal force of a centrifuge.[1] The svedberg is technically a measure of time, and is defined as exactly 10−13 seconds (100 fs).
The Svedberg unit (S) offers a measure of particle size based on its rate of travel in a tube subjected to high g-force.[1]
It should not be confused with SI unit sievert or the non-SI sverdrup.