The present review has been undertaken with a view to exploring the existence and the magnitude of any such differences. One might therefore expect some differences to exist between theoretical predictions and experimental results due to this oversimplification. The above assumption seems to have some basis in theory only in the case of ideal monatomic gases it has, however, been carried over implicitly to both liquids and gases of all degrees of complexity. In making this assumption classical hydrodynamics parts company from classical elasticity, in which two fundamental quantities, the Lamé constants λ and μ, are introduced. The other quantity, μ ′, the second coefficient of viscosity, is assumed to be equal to − 2 μ 3 in order that κ ( = ( 2 μ + 3 μ ′ ) 3 ), the coefficient of bulk viscosity, should be zero.
![coefficient of viscosity coefficient of viscosity](https://images.gopracticals.com/basic/physics/physics-basic-viscosity-4.jpg)
The classical theory of the dynamics of viscous fluids is based on the assumption that there is only one fundamental coefficient of viscosity, μ, the coefficient of shear viscosity. Since, the formula for coefficient of viscosity is given by, Coefficient of Viscosity Unit and Dimension The meter-kilogram-second or MKS unit is: Kilogram per meter per second or The centimeter-gram-second or CGS unit of coefficient of viscosity, η isĭyne-sec/ cm ^ 2 which is equal to Poise. 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. SI Unit of Coefficient of ViscosityĮvery liquid has its own specific viscosity and the measure of this attribute is called the coefficient of viscosity. The difference in the stream of velocity between the adjacent layers of the fluid is measured in the velocity gradient.īasically, the viscosity of gas is less than the liquid viscosity. F is the tangential force required to maintain a unit velocity gradient between two parallel layers of liquid of unit area.ĭ is the distance between the two layers of liquid skidding over each other.