![]() d is the distance between the two layers of liquid skidding over each other.Where F is the tangential force required to maintain a unit velocity gradient between two parallel layers of liquid of unit area. Hence the coefficient of viscosity is given by, The ratio of the shearing stress to the velocity gradient of the fluid is called the coefficient of viscosity η. Hence the coefficient of viscosity is a measure of the resistance of the fluid to deformation at a given rate due to internal friction. ![]() The SI unit of η is Newton-second per square meter (Ns.The coefficient of viscosity η is defined as the tangential force F required to maintain a unit velocity gradient between two parallel layers of liquid of unit area A.Every liquid has its specific viscosity and the measure of this attribute is called the coefficient of viscosity.In contrast, fluids with low viscosity have weaker intermolecular forces or looser particle arrangements, resulting in easier flow. In fluids with high viscosity, the molecules or particles are strongly bonded or closely packed, leading to greater resistance to flow. Viscosity arises due to the interactions between the molecules or particles within a fluid. The coefficient of viscosity is denoted by the symbol η (eta) and is measured in units of pascal-seconds (Pa ![]() It quantifies the internal friction or stickiness of a fluid as it flows, particularly in response to applied shear stress. The coefficient of viscosity, also known as dynamic viscosity or simply viscosity, is a property of fluids that measures their resistance to flow.
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