Kinematic viscosity is defined as area divided by time the appropriate units are metre squared per second. The absolute viscosity of a fluid is divided by its mass density to get kinematic viscosity. 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. On the contrary, low viscosity fluids are more volatile, creating environmental problems.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. Oils with too high viscosity don't protect well against mechanical friction, resulting in heat generation. Viscosity will affect the thickness of the oil film as well as the effectiveness of its protective qualities. These films are used to protect equipment from mechanical wear and may also have extra benefits such as creating a barrier to corrosion. The viscosity of oil and lubricants are often measured in industrial settings. Kinematic viscometers determine the kinematic viscosity by measuring the time it takes for the fluid to pass through a portion of a capillary. Care must be taken when interpreting values and the temperature at which the values were measured. Understanding the distinction comes into play in industrial settings as record data is normally reported as kinematic viscosity, but onsite measurements are often measured as dynamic viscosity. Kinematic viscosity is not the same as dynamic viscosity, although they are related mathematically by the density of the fluid. ![]() This intermolecular friction is what makes the fluid resistant to change in shape and explains the thick and slow moving properties of highly viscous fluids. The stronger the intermolecular force, the more the molecules will stick together as they collide, manifesting a frictional interaction. Strongly polarized interactions like hydrogen bonding in water or interactions between large non-polar surfaces in viscous oils produce stronger intermolecular forces. Viscosity results from the intermolecular forces between molecules in a liquid. Corrosionpedia Explains Kinematic Viscosity
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