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Question

(B) Surface tension $(\gamma)$ is defined as force per unit length: $\gamma = \frac{F}{l} = \frac{N}{m} = \frac{kg \ m \ s^{-2}}{m} = kg \ s^{-2}$.Coe

Vedclass · Accepted Answer

$kg \ s^{-2}, \ kg \ m^{-1} \ s^{-1}$

Vedclass · Answer

(B) Surface tension $(\gamma)$ is defined as force per unit length: $\gamma = \frac{F}{l} = \frac{N}{m} = \frac{kg \ m \ s^{-2}}{m} = kg \ s^{-2}$.Coefficient of viscosity $(\eta)$ is defined by Newton's law of viscosity: $F = \eta A \frac{dv}{dx}$, which gives $\eta = \frac{F}{A (dv/dx)}$.The units are $\frac{N}{m^2 (s^{-1})} = N \ s \ m^{-2} = (kg \ m \ s^{-2}) \ s \ m^{-2} = kg \ m^{-1} \ s^{-1}$.Thus, the units are $kg \ s^{-2}$ and $kg \ m^{-1} \ s^{-1}$ respectively.

The units of surface tension and viscosity of liquids respectively are

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