![]() In some cases, kinematic viscosity is more valuable than absolute or dynamic viscosity. ![]() As a result, the unit of viscosity is newton-second per square metre, which is usually expressed in SI units as pascal-second. Dynamic viscosity has the dimensions force-time area. Fluids that behave in this manner are known as Newtonian fluids, after Sir Isaac Newton, who first developed this mathematical description of viscosity. The dynamic, or absolute, viscosity, or simply the viscosity, is the name given to this constant. In other words, the shear stress divided by the rate of shear strain is constant for a given fluid at a set temperature. ![]() The rate of shear strain, or rate of deformation, is precisely related to the tangential, or shearing, stress that generates flow in many fluids. It regulates liquid flow in processes such as spraying, injection moulding, and surface coating. Viscosity is a crucial component in determining the forces that must be overcome when fluids are employed in lubrication and transferred in pipes. Internal friction between molecules can be thought of as viscosity this friction opposes the development of velocity differences within a fluid since a section of a fluid that is compelled to move carries along nearby parts to some extent. The viscosity of molasses, for example, is higher than that of water. Fluidity is a measure of how easily a substance flows and is defined as the reciprocal of viscosity. The resistance of a fluid (liquid or gas) to a change in shape or movement of neighbouring portions relative to one another is referred to as viscosity.
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