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Explain whyWater on a clean glass surface tends to spread out while mercury on the same surface tends to form drops. |
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Answer» In the case of mercury the mercury glass, angle of contact is obtuse. To obtain this obtuse value of angle of contact, mercury tends to form a drop. But in the case of water, the water-glass angle of contact is acute. Thus the water tends to spread out to achieve this acute angle of contact. |
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