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 Viscosity:-

        Viscosity is a measure of resistance to flow of liquid.


     Viscosity is one of property of liquid.  

     Some liquids can either  flow more readily or very slowly & this type of property is called viscosity of liquid.

EX:- Any type of liquid,.....etc.

    

       Viscosity can be conceptualized as quantifying the internal frictional force that arises between adjacent layers of fluid that are in relative motion.

Also gases have property of viscosity.

for example, syrup has a higher viscosity than water.



According to the above image (gif).Imagine,this(syrup) liquid are in molecule layer format flowing in half cut pipe.Then in example of water, these molecules goes very fast and in syrup molecules goes very slowly because of internal forces.The molecule layers are arranged in order of one over other.The lower layers comes in contact with stationary lower surface and velocity of syrup layer increases with distance from the stationary surface.

The displacement of different layers relative to one another is a opposed by the internal friction and this conclusion called viscosity of liquid.


When the flow of liquid becomes steady, there will be a constant difference in the velocity between two different layers.It has been found that force per unit area required to maintain this condition is directly proportional to the difference of velocity 'V'of two adjacent layers and inversely proportional to the distance 'X' between them.

    Thus,


   Force ⋉ ____V____

                           X        


                   OR


    F=ղ *___V___

                   X      





ղ ' is a proportinality constant, known as a coefficient of viscosity.


Coefficient of viscosity :-

       The coefficient of viscosity can be defined as " the force per unit area (stress) required to maintain unit difference or velocity between two parallel layers in the liquid , unit distance apart".


Fluidity:-

       The reciprocal of viscosity called Fluidity.

Also, the ability of substance to flow easily called Fluidity.


 Fluidity = Ø=___1__

                             ղ    

                         


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