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State whether the following is true or false.
The Kelvin effect becomes negligible for droplets larger than about a micrometre.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: D

The correction to the equilibrium vapour pressure falls away rapidly with increasing radius. Beyond roughly a micrometre a droplet behaves for practical purposes like a flat water surface. Curvature therefore matters only at the very beginning of a droplet's life.

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