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Supercooled water below zero degrees represents a

  • A.true triple point
  • B.system of two components
  • C.metastable equilibrium
  • D.stable equilibrium

Answer: C

The liquid persists below its freezing point only for want of a nucleus, and the smallest disturbance or seed crystal converts it to ice at once. It appears on the diagram as a dotted extension of the vaporisation curve.

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