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Diffusional growth of an ice crystal is faster than that of a droplet of the same mass because

  • A.latent heat of sublimation is smaller than that of condensation
  • B.the crystal is not spherical and has a larger capacitance
  • C.ice has a higher saturation vapour pressure than water
  • D.the crystal falls faster and ventilates more strongly

Answer: B

Growth depends on the electrostatic capacitance of the shape, and a plate or dendrite exceeds a sphere considerably. The larger vapour excess over ice adds to the advantage. Both geometry and thermodynamics favour the crystal over the drop.

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