Chemistry

# Types of Viscosity

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viscosity is a physical property of any fluid which differentiates different fluids from each other. when the fluids move quickly in a container, their particles collide with each other by creating a certain resistance with the walls of the container against its movement. this property of resistance of fluids is known as viscosity. however, it can be measured with two well know tools called rheometers and viscometers.

Note: The more resistance these liquids or fluids oppose to flow, the more viscosity they will have.

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### Types of viscosity

there are four known types of viscosity which are as follows:

• Dynamic viscosity
• Kinematic viscosity
• Extensional viscosity
• Apparent viscosity

## What is Dynamic viscosity?

the relationship between velocity gradient and the shear stress is called dynamic viscosity. Dynamic viscosity is also known as absolute viscosity and more likely relates to non-Newtonian fluids. it relates to the internal resistance of a fluid to flow on applying the force.

• measured in units (pascal-seconds) in the International System of units.
• shows the type of resistance of the fluids either grater or smaller on applying certain shear stresses on the movement of particles.
• it depends directly on the temperature of liquids having SI unit poise and represented by the letter P.

Try Also: Viscosity Definition and Formula with Units

## What is Kinematic viscosity?

when the dynamic viscosity is divided by the density of the fluid, kinematic viscosity is gained by keeping the temperature the same of both viscosities. their SI units as same. it is represented by a symbol V and expressed square meters over seconds in the International System of units. it is usually observed under the Newtonian force.

Any viscometer that uses gravity in its measurement design is measuring kinematic viscosity. It is expressed in Stokes units or in centistokes – CST -, where one cSt equals 0.01 St. It is also measured as square millimeters per second in SI units.

## What is Extensional viscosity?

it is the type of viscosity of a fluid that shows non-Newtonian behavior when applying some tensile stress. it is the relationship between the stress and the deformation speed that occurs in the shaft, be it axial or biaxial. ## What is Apparent viscosity?

when shear stress is divided by the speed that the fluid takes to deform by the presence of non-linear behavior, it results in apparent viscosity. The viscosity and shear rate relationship also refers to the apparent viscosity.

this type of velocity is measured by dividing shear stress by shear rate which is directly affected by the shear rate for non-Newtonian fluids and remains constant for Newtonian fluids.

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