Question

Explain viscosity. Give some examples.Where is its being played in nature?


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Answer 1

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Answer:

Viscosity is the property of fluids in which one layer of fluid try to oppose the motion of another layer of fluid during their free flow.

It is also known as the friction of liquids.

In nature it occurs everywhere ,where there is fluid ,some examples are given below :

• In flowing river water.
• During motion of air in the atmosphere.
• Flow of oils , kerosene and petrol and diesel in the vehicles .
• etc...

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Answer 2

$\boxed{Question-}$Explain viscosity. Give some examples.Where is its being played in nature?

$\huge\bold{ANSWER-}$

$\bold{Viscosity}$of a liquid is the property of the liquid by virtue of which it opposes the relative motion amongst its different layers.

Consider a liquid layer moving over another layer which is at rest. Due to force of cohesion, the upper layer has a tendency to move the lower layer along with it and lower layer tends to stop the motion of the upper layer. As a result , and internal frictional force called "$\bold{viscous\: drag}$"comes into play, which opposes the relative motion amongst its different layers This internal frictional force in a liquid which opposes the relative motion amongst its different layers is called $\bold{Viscosity}$.

Some of the applications related with the study of viscosity are -:

(i)$\bold{Chemists}$use this study to determine molecular weights and shape of the large organic molecules such as proteins and cellulose.

ii) $\bold{In\: industry}$, the measurements of viscosity and its variation with temperature are useful in judging whether a given lubricant oil is useful for a machine or not.

iii) $\bold{In\: railway\: terminals}$, the liquids of high viscosity are used as buffers.