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What is viscosity?
The dynamic viscosity or viscosity coefficient h is the tangential force per unit surface, known as shearing stress t and expressed in pascals, necessary to move, parallel to the sliding plane, a layer of liquid of 1 square metre at a rate (v) of 1 metre per second relative to a parallel layer at a distance (x) of 1 metre.
The kinematics viscosity v, expressed in square metres per second, is obtained by dividing the dynamic viscosity by the density expressed in kilograms per cubic metre, of the liquid measured at the same temperature, i.e. v = h/r. The kinematics viscosity is usually expressed in square millimeters per second.
A capillary viscometer may be used for determining the viscosity of Newtonian liquids and a rotating viscometer for determining the viscosity of Newtonian and non- Newtonian liquids.
