ratio of the flow velocity at the considered point to a reference velocity measured at the same time and being either the velocity at a particular point (e.g. the centre of circular conduit) or the discharge velocity in the measuring section, voo kiiruse suhe antud punktis samal ajal mõõtmisel saadud tugikiiruse väärtusega, milleks võib olla kiirus konkreetses punktis, nt nt vookiirus keskjoonel, või vedeliku keskmine aksiaalkiirus, ratio of the velocity at a given to point to a reference velocity measured at the same time which may be the velocity at a particular point (for example the centre-line velocity) or the mean axial fluid velocity