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Define surface tension.


Surface tension is the property of liquid due to which the free surface of liquid at rest behaves like a stretched membrane and tries to acquire the minimum surface area.

For e.g., oil and water do not mix, oil rises up in a cotton wick.  
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What is force of adhesion?

What is force of cohesion?

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.

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?

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