One type of capillary-tube viscometer is shown in Video ∀1.3 and in Fig. P 1.41 at the top of the following page. 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 kinematic viscosity, ν, in m^2 / s is then obtained from the equation ν=K R^4 t 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^

Video: Measuring Viscosity of Propylene Glycol Solution Using a Glasstube Viscometer