What happens to surface tension when impurity is mixed in liquid?

When impurities are mixed in liquid, surface tension of liquid decreases. The soluble substances when dissolved in water, decreases the surface tension of water. 
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How does the surface tension of liquid change with temperature?

With increase in temperature, the surface tension of liquid decreases. Surface tension of liquid is zero at boiling point and it vanishes at critical temperature.
At critical temperature, liquid can expand without any restriction.

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When is the shape of meniscus of liquid in the capillary tube concave upwards?

The shape of the meniscus liquid in the capillary tube concave upwards if the angle of contact of liquid is less than 90°.
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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?

The shape of the meniscus of liquid in the capillary tube is convex that is, pointing upwards when the angle of contact of liquid is greater than 90°. 
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