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What makes kinematic viscosity differ from dynamic ?

Absolute (or Dynamic) Viscosity:

  •  This is a measure of how resistive the flow of a fluid is between two layers of fluid in motion. 
  • A value can be obtained directly from a rotational viscometer which measures the force needed to rotate a spindle in the fluid
    • SI unit          - mPa.s    .
    • cgs unit        - cP  .
Kinematic Viscosity:

  •  This is a measure of how resistive the flow of a fluid is under the influence of gravity.
  •  Kinematic viscometers usually use the force of gravity to cause the fluid to flow through a calibrated orifice, while timing its flow.
    • SI unit          - mm^2.s   .
    • cgs unit        - cSt(centi stroke).

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