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svedberg
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.〔 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.〔
It should not be confused with SI unit sievert or the non-SI sverdrup.
==Naming==
The unit is named after the Swedish chemist Theodor Svedberg (1884–1971), winner of the 1926 Nobel Prize〔http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1926/〕 in chemistry for his work on disperse systems, colloids and his invention of the ultracentrifuge.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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