![]() These manual glass viscometers require the use of a Constant Temperature Bath in order to stabilize the sample temperature for measurement.Ībsolute Viscosity: The tangential force per unit area of two parallel planes at unit distance apart when the space between them is filled with a fluid and one plane moves with unit velocity in its own plane relative to the other. Most the laboratory instruments use glass capillaries or “tubes”. There are several standardized capillaries in use. The more viscous an oil, then the longer it takes to flow via a capillary under the influence of gravity alone. ![]() Generally, measurements made using capillary viscometers rely on the relation between time and viscosity. The most common method for measuring kinematic viscosity is the use of a gravimetric capillary (Figure 1) that is usually temperature controlled at 40 ☌ and 100 ☌ for multigrade oils, and 40 ☌ for single grade oils. Video courtesy of Ekeeda - Measuring Kinematic Viscosity
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