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Question

When two blocks of ice are pressed against each other then they stick together (coalesce) because


A
cooling is produced.
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B
heat is produced.
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C
increase in pressure increase melting point.
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D
increase in pressure, decrease in melting point.
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Solution

The correct option is C increase in pressure, decrease in melting point.
When they are pressed against each other, pressure increases so the melting point decreases. A layer of water forms at the contact area. This makes both the blocks of ice to stick together when the pressure is released.

Physics

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