Molten gas tries to acquire the minimum surface area and hence heats up due to surface tension. Rounding off the edges makes them acquire the minimum surface area.
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Explain how the dental plate clings to the roof of mouth?
Dental plate clings to the roof of the mouth because of the presence of adhesive force between saliva and dental plate.
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Why does the oil spread over the water?
Surface tension of oil is less than water, therefore, oil spreads over water and do not mix with each other.
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What is the origin of surface tension?
Surface tension is originated as a result intermolecular forces. Surface tension is concerned with only liquid.