https://doi.org/10.1351/goldbook.R05412
The number of rotations divided by time: \[f_{\rm{rot}}=\frac{\rm{d}N}{\rm{d}t}\] The synonyms rate of rotation, rate of revolution, centrifugal speed, centrifugation speed, and the traditional units of rotational frequency such as revolutions per minute, r.p.m., ppm, \(\rm{rev min}^{-1}\), \(\rm{r min}^{-1}\), are not recommended.
Sources:
PAC, 1994, 66, 897. (Quantities and units for centrifugation in the clinical laboratory (IUPAC Recommendations 1994)) on page 904 [Terms] [Paper]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 991 [Terms] [Paper]
PAC, 1994, 66, 897. (Quantities and units for centrifugation in the clinical laboratory (IUPAC Recommendations 1994)) on page 904 [Terms] [Paper]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 991 [Terms] [Paper]