What is relegation? Give its practical application.
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Regelation is the phenomenon of melting under pressure and freezing again when the pressure is reduced. Many sources state that regelation can be demonstrated by looping a fine wire around a block of ice, with a heavy weight attached to it. The pressure exerted on the ice slowly melts it locally, permitting the wire to pass through the entire block. The wire's track will refill as soon as pressure is relieved, so the ice block will remain solid even after wire passes completely through. This experiment is possible for ice at −10 °C or cooler, and while essentially valid, the details of the process by which the wire passes through the ice are complex. The phenomenon works best with high thermal conductivity materials such as copper, since latent heat of fusion from the top side needs to be transferred to the lower side to supply latent heat of melting.
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Ice can melt when pressure is applied.
Explanation:
Regelation is a process in which the state of a substance can be changed by application of pressure and then releasing it. A substance (that is frozen solid) can melt when pressure is applied and when lifted it freezes again.
Ice can melt when pressure is applied.
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