What is surface tension at critical temperature?

At critical temperature, surface tension reduces to zero. 
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How will the liquid rise in a capillary tube in state of weightlessness?

In the state of weightlessness, the liquid rises to brim of capillary tube.  
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On which side of the meniscus the pressure is more?

On the concave meniscus, pressure is more because of surface tension.

Force exerted by the liquid is given by, F = Sl 

Concave meniscus is formed as a result of water creeping up on the surface of the sides of the container. 
 
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A capillary is dipped in a liquid that sticks with the walls of tube. How will the level of liquid change in the capillary tube?


When capillary is dipped in a liquid that sticks with the walls of the tube, the level of liquid in the capillary tube will rise. 
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A capillary is dipped in a liquid that does not stick with the walls of tube. How will the level of liquid change in the capillary tube?

The level of liquid in the capillary tube will fall when a capillary is dipped in a liquid that does not stick with the walls of the tube. 
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