What is the effect of pressure on the melting point of a substance? what is the relegation ?
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Regelation occurs only for substances, such as ice, that have the property of expanding upon freezing, for themelting points of those substancesdecrease with the increasing externalpressure. The melting point of ice falls by 0.0072 °C for each additional atm ofpressure applied.
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Regelation is the phenomenon of melting under pressure and refreezing when the pressure is reduced. For the experiment, take a slab of wire and a metallic wire with 5 kg of blocks attached to it on either side. Put the wire over the glass slab as shown in the diagram.
It will be observed that the wire gradually penetrates and passes through the ice slab. This happens due to the fact that the ice melts at a lower temperature due to the increase in pressure just below the wire. The wire passes through the ice slab without splitting it. This phenomenon of refreezing is known as regelation.
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