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    Mechanical Properties of Fluids
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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 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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    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.

    Given that, for both the limbs mercury is in level. Therefore, the pressure due to height column of water and spirit will be same. 

    Also, given water stands to a level of 12.8 cm above the mercury.

    Let, h be the length of the spirit in the U- tube. 

    So, Pressure due to 12.8cm  of water = Pressure due to h cm of spirit

    or       1 x g x 12.8 = 0.8 x g x h

    or                      h = 16 cm, is the length of the spirit in the U-tube. 
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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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    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?
    According  to Pascal's law,

    According  to Pascal's law,
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