Question

What is regelation?

(a) Refreezing of ice on addition of impurities

(b) Refreezing of ice on reduction in pressure

(c) Melting of ice at lower temperature than its melting point due to increase in pressure

(d) Melting of ice at higher temperature than its melting point

The question was posed to me by my school principal while I was bunking the class.

I would like to ask this question from Thermal Properties of Matter topic in division Thermal Properties of Matter of Physics – Class 11

Answer 1

The correct answer is (b) Refreezing of ice on reduction in pressure

To explain: When increase in pressure causes water to melt. It may refreeze on removal of this extra pressure. This refreezing is called relegation.