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Define cohesive and adhesive force....

Define cohesive and adhesive force.

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The forces of attraction between the molecules of the same substance are known as cohesive forces whereas adhsive forces are the forces which exist between the molecules of two different substances.
For example, water particles stick to the glass rod due to adhesive forces.
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Surface tension arises from the cohesive force between the surface molecules. Interplay between cohesion and adhesion force make the surface inclined at acute or obtuse angle with the contacting solid surfaces. This causes a capillary rise (or fail) given as h=(2Tcostheta)/(rhogr) , where theta= angle of contact T= surface tension rho= density of the liquid, g= acceleration due to gravity and r= radius of the capillary tube. Q. In capillary action theta can be: