Dynamic Vs Kinematic Viscosity 

Dynamic vs kinematic viscosity is defined as the elemental property while studying the flow of liquid for any application. The two basic types of viscosity are kinematic and dynamic. The association between these two properties is quite simple. It seems like a simple concept at first glance. But in reality, there are numerous terms that come under the definition of it. These terms determine the measurement of it.

What is the Difference Between Kinematic Viscosity and Dynamic Viscosity

Apart from the difference between dynamic viscosity and kinematic viscosity, a few relations of this concept should be cleared. The internal resistance of a liquid flow suggests an external force applied in the movement of a liquid.

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CGS Unit of Different Viscosities

Sometimes students is asked about units of viscosities. Since there are several types of density and each has its unit, to differentiate between dynamic viscosity and kinematic viscosity in units, students can use Poise (P) as the CGS unit of dynamic density and Stokes (St) as the CGSs unit of kinematic viscosity. 

Calculation of Viscosity

The density of a liquid is estimated based on a ratio of shearing stress to its velocity gradient. If we rest a sphere, into a liquid, we can evaluate the density by using the formula mentioned below:

• η = 2ga2(Δρ)9v
• η= viscosity
• Δρ= difference of density of the fluid and tested sphere

Viscosity is measured in Pascal seconds, i.e., Pa s. Moreover, the velocity of the spheres increases with the density of a fluid. However, temperature increases with the decreasing density of a liquid.

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Difference Between Viscosity and Kinematic Viscosity

Some Other Types of Viscosity are as Follows:

Steady shear viscosity – This refers to the relationship between viscosity and shear rate. This implies the shear stress which is applied to a fluid divided by the shear rate. This viscosity remains constant when measuring Newtonian fluids, but it gets affected while measuring the viscosity of non-Newtonian fluids.

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