The angle of contact at the interface of water glass is 0 .Ethylalcohol glass is 0 , mercury glass is 140 and Methyliodide glass containing 30 .A glass capillary is put in a trough containing one of these four liquids .It is observed that the meniscus is convex .The liquid in the trough is ??????
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The meniscus of liquid in a capillary tube will be convex upwards if the angle of contact is obtuse. It is so when one end of a glass capillary tube is immersed in a trough of mercury.
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