[Answer] What is viscosity?

Answer: Viscosity is the rate of which a substance resists flow

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What is viscosity? Viscosity index - Wikipedia Viscosity index - Wikipedia SAE J300 - Wikipedia SAE J300 - Wikipedia The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids it corresponds to the informal concept of "thickness": for example syrup has a higher viscosity than water. Viscosity can be conceptualized as quantifying the internal frictional force that arises between adjacent layers of fluid that are in relative motion. For instance when a fluid is forced through a tube it flows more quickly near the tube's axis than near its walls. In such a case experiments show that some stress (such as a pressure difference between the two ends of the tube) is needed to sustain the flow through the tube. This is because a force is required to overcome the friction between the layers of the fluid which are in relative motion: the strength o… For instance when a fluid is forced through a tube it flows more quickly near the tube's axis than near its walls. In such a case experiments show that some stress (such as a pressure difference between the two ends of the tube) is needed to sustain the flow through the tube. This is because a force is required to overcome the friction between the layers of the fluid which are in relative motion: the strength of this force is proportional to the viscosity. A fluid that has no resistance to shear stress is known as an ideal or inviscid fluid. Zero viscosity is observed only at very low temperatures in superfluids . Otherwise the second law of thermodynamics requires all fluids to have positive viscosity; such fluids are technically said to be viscous or viscid. A fluid with a high viscosity such as pitch may appear to be a solid . Viscosity is a physical property of fluids. It shows resistance to flow. In a simple example water has a low viscosity as it is "thin". Syrup and tar on the other hand have a high viscosity as they are "thick". A way to test for viscosity is the speed at which the substance runs down a slope. Syrup would reach the bottom very slowly and water would be much quicker. Viscosity is a material property which describes the resistance of a fluid to shearing flows. It corresponds roughly to the intuitive notion of a fluid's 'thickness'. For instance honey has a much higher viscosity than water. Viscosity is measured using a vi...

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