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What is force of cohesion?


Force of cohesion is the intermolecular force between two same type of molecules.

For example, solids have high cohesive properties, so they do not stick to the surface they come in contact with. 
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What is force of adhesion?

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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