Mechanical Properties of Fluids
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Why does the wick of lamp is made of cotton?

Wick is made of cotton as the capillaries inside it enable the oil to rise in it. This makes the burning process more effective. 
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    When is the shape of meniscus of liquid in the capillary tube convex upwards?
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    When is the shape of meniscus of liquid in the capillary tube concave upwards?
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    How does the surface tension of liquid change with temperature?
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    What happens to surface tension when impurity is mixed in liquid?
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