The SI unit of Kinematic viscosity is

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JKSSB JE Civil Jal Shakti 5 Dec 2022 Official Paper (Shift 2)
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  1. Kg/m3
  2. kN/m3
  3. m3/kg
  4. m2/s

Answer (Detailed Solution Below)

Option 4 : m2/s
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Explanation:

Kinematic viscosity:

Kinematic viscosity is defined as the ratio of dynamic viscosity and density of the fluid.

\(kinematic~ viscosity= \frac {dynamic ~ viscocity}{density ~of ~fluid}\)

\(ν = \frac {μ}{ρ }\)

  • SI unit = m/ s 
  • CGS unit = Stokes or cm/ s
  • 1 Stoke = 10-4 m2 / s

Additional Information

Dynamic Viscosity  ( µ )

  • Viscosity can be defined as the measure of a fluid's resistance to deformation at a given flow.
  • Caused by friction within a fluid.
  • Result of intermolecular forces between the particles within a fluid.
  • SI unit N-s/m2 or Pa-s.

Shear stress is given by,

\(Shear\;stress = \;\mu \;\frac{{du}}{{dy}}\)

where,

µ = Dynamic Viscosity of fluid

\(\frac{u}{y}\)= Rate of shear deformation

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