Q9 of 55 Page 53

What is SI unit of viscosity coefficient (η)?

Resistance to the flow of liquid is called viscosity.

F=η.A


Here,


is a velocity gradient, η is a viscosity coefficient, A is area


η =.


Putting, F = N, dx=m, A= m2,v=ms-1


η= N/m2. m/ms-1


η= Nsm-2


η is the proportionality constant , also known as coefficient of viscosity. SI unit of viscosity is Nsm-2 = Pascal second (Pa s = 1kgm-1s-1)

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