First slide

Surface tension and surface energy

Question

For which of the two pairs, the angle of contact is same

Moderate

A

Water and glass; glass and mercury
B

Pure water and glass; glass and alcohol
C

Silver and water; mercury and glass
D

Silver and chromium; water and chromium

Solution

Both liquids water and alcohol have same nature (i.e. wet the solid). Hence angle of contact for both is acute.

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