Types of Viscosity

In this article, you are going to learn a complete explanation about the Types of viscosity.

This post Also includes:

  • Types of viscosityTypes of Viscosity
  •  Dynamic viscosity
  • Kinematic viscosity
  • Extensional viscosity
  • Apparent viscosity
  • Lots more

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Let’s Dive right in…!

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.

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.

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.


Extensional viscosity

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.

FAQ’s (Frequently Asked Questions)

What are the types of viscosity?

Types of Viscosity: According to, there are four basic types which are as follows:

  1. Dynamic viscosity
  2. Kinematic viscosity
  3. Extensional viscosity
  4. Apparent viscosity

What is the SI unit of viscosity?

the SI Unit of viscosity is Newton-second per square meter and is expressed as pascal-second.

What is dynamic viscosity and kinematic viscosity?

Dynamic viscosity measures the internal resistance of fluid during the flow while the kinematic viscosity measures internal resistance at rest.

What is a good example of viscosity?

Peanut Butter, Honey, Greece, Milkshake are some common examples of Viscosity.

Is viscosity a vector?

No, it is not a vector. the reason is that viscosity is just the property of liquid and is equal to the magnitude of dragging force per unit area. it does not have any specified direction. it has the only magnitude which is led the viscosity under scaler quantity.

the basic difference between apparent viscosity and dynamic viscosity is that apparent viscosity is shear stress divided by shear rate. for Newtonian fluids, it remains constant. on the other hand, for non-newtonian fluids, apparent viscosity depends on the shear rate of fluid, while Dynamic viscosity is a property of a fluid that resists the movement of fluid layer over another adjacent fluid layer.

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