sedimentation coefficient, s

https://dx.doi.org/10.1351/goldbook.S05535
Velocity of sedimentation divided by the acceleration of the force field (gravitation or centrifugation).
Source:
PAC, 1996, 68, 957 (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 992
See also:
Purple Book, p. 62
PAC, 1994, 66, 897 (Quantities and units for centrifugation in the clinical laboratory (IUPAC Recommendations 1994)) on page 904