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Which one of the following is the CGS unit of dynamic viscosity?

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+1 vote
in Fluid Mechanics by (118k points)
Which one of the following is the CGS unit of dynamic viscosity?

(a) Stokes

(b) Pa-s

(c) m^2/s

(d) Poise

The question was asked in an interview.

Enquiry is from Viscosity in portion Properties of Fluids of Fluid Mechanics

1 Answer

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Best answer
Correct choice is (d) Poise

For explanation I would say: where F= viscous force, A= area, du ⁄ dx = velocity gradient, μ = co-effcient of viscosity. Therefore,

CGS unit of μ is = dyne-s/cm^2. 1 Poise= 1 dyne-s/cm^2 and 1 Stokes= 1 cm^2/s. Thus, the CGS unit of μ will be Poise. Stokes is the CGS unit of kinematic viscosity.

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