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The angle of contact at the interface of...

The angle of contact at the interface of water glass is `0^(@)` ethylalcohol-glass is `0^(@)` mercury glas is `140^(@)` and methyliodide-glass is `30^(@)` A glass capillary is put in a through containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the through is

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The angle of contact at the interface of water glass is 0^(@) ethylalcohol glass is 0^(@) mercury glass is 140^(@) and methyliodide glass is 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

The angle of contact at the interface of water glass is 0^@ , Ethylacohol- glass is 0^@ ,mercury glass is 140^@ and Methyliodide - glass is 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

The angle of contact at the interface of water-glass is 0^@ . Ethyl alcohol-glass is 0^@ , Mercury-glass is 140^@ and Methyl iodide-glass is 30^@ . A glass capilalry 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

"The angle of contact of mercury with glass is obtus, while the water with glass is acute." Why?

What is mean by angle of contact ? Explain why it is accute in case of water and glass and obtuse in case of mercury and glass.