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Q: One type of capillary-tube viscometer. For this device the liquid to be tested is drawn into the tube to a level above the top etched line. The time is then obtained for the liquid to drain to the bottom etched line. The kinetic viscosity, v, in m2/s is then obtained from the equation v = KR4t where K Is a constant, R is the radius of the capillary tube in mm, and t is the drain time in seconds. When glycerin at 20°C is used as a calibration fluid in a particular viscometer the drain time is 1,430 s. when a liquid having a density of 970 kg/m3 is tested in the same