One type of capillary-tube viscometer is shown in Fig.?PI.41. 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/m^3?is tested in the same viscometer the drain time is 900 s. what is the dynamic viscosity of this liquid?

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Glass strengthening. bridge Capillary tube Etched lines