What is viscosity? measurement of viscosity.

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Viscosity

viscosity is Resistance to flow. it is often referred to as the thickness of fluid.

Standard definition


it is the measure of the resistance of a fluid to gradually formation by shear or tensile stress.

Types


Dynamic viscosity

which is a measure of the shear stress per unit area required before a sample begins to deform. This characteristic is typically expressed in millipascal seconds (mPa-s).

Kinematic viscosity

which refers to the resistive flow of a fluid under the influence of gravity. This property is density-dependent and is measured in square meters per second (m2/s).


The relation between kinematics viscosity and dynamic viscosity is,


Kinetic viscosity=dynamic viscosity/density of the fluid


Methods to measure viscosity

  1. Flow through a capillary tube
  2. Drag experienced by falling ball  through fluid
  3. Drag experience by one end of the concentric cylindrical carrying fluid between them when other  cylinder is rotating.

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