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What is force of adhesion?


Force of adhesion is the intermolecular force between two different types of molecules. 

E.g: The effect of capillary action is due to the adhesive force. The water molecules touching the surface of the container are at a higher level (meniscus) is also an example of adhesive force. 
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What is force of cohesion?

Two limbs of hydraulic lift have area of cross-section 5 cm2 and 100 cm2. To lift the weight of 24 kg placed on 5 cm2 cross-section, what force must be applied on the piston of cross-section 100 cm2?

Define surface tension.

A U-tube contains water and methylated spirit separated by mercury. The mercury in the two limbs of the tube is in level. If the water stands to a level 12.8cm above the mercury, then find the length of spirit in the U-tube. Take relative density of spirit as 0.8.

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