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: 1992 [Terms
PAC, 1996, 68
, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)
) on page 997 [Terms