1.

What is regelation? Why is it observed?

Answer»

Solution :i. The PHENOMENON in which the ICE converts to liquid due to applied pressure and then re- converts to ice once the pressure is removed is CALLED regelation.
ii. a. Due to applied pressure, melting point of ice is lowered below `0^(@)C`.
b. As a result, ice gets converted into water at ` 0^(@) C`.
c. When the applied pressure is removed, the melting point is RESTORED to `0^(@)C` and water gets re-converted into ice.


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