Cup viscometers measurements are inherently independent from the specific weight of the fluid under measurement. In fact they directly measure K.I.N.E.M.A.T.I.C VISCOSITY through the flowing time.

This quantity is so universally used that often kinematic viscosity is directly expressed in "seconds" and this "viscosity" is often used for oils. BTW, kinematic viscosity is the only "viscosity" that has been usefully modeled in linear way versus temperature with appropriate charts.


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