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The phenomenon in which ice converts to liquid under applied pressure and re-converts to ice once the pressure is removed is called:
Avaporisation
Bhumidity
Cregelation
Dcondensation
Answer & Solution
Correct answer: C. regelation
1. Applying pressure lowers the melting point of ice below 0 °C, so it melts.
2. When the pressure is removed, the melting point returns to 0 °C and the water re-freezes.
3. This melt-then-refreeze under pressure is called regelation.
4. Vaporisation and condensation involve the gas phase, not pressure-driven melting.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 5 "Heat", p.73_
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