The time is measured for a fixed volume of liquid to
flow under gravity through the capillary of a calibrated
viscometer under a reproducible driving head and at a closely
controlled and known temperature. The kinematic viscosity
(determined value) is the product of the measured flow time
and the calibration constant of the viscometer. Two such
determinations are needed from which to calculate a kinematic
viscosity result that is the average of two acceptable determined
values