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Derive the dimensional formula for co-efficient of viscosity and hence its unit.

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Derive the dimensional formula for co-efficient of viscosity and hence its unit.

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Units:

We have 

in cgs system, the unit of η is called poise.

1 poise 

= dyne cm-2 sec.

The S.I.unit of η is Pa.s (Pascal second) or deca poise.

1 dec poise = 

= 1Nsm-2

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