Vector quantity equal to the derivative of the position vector with respect to time (symbols \(u\),\(v\),\(w\) for components of \(c\)).
Green Book, 2nd ed., p. 11 [Terms
ISO, 31-1 [Terms
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)
) on page 997 [Terms