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A larger soluble aerosol particle activates at

  • A.exactly the same supersaturation as a smaller one
  • B.a supersaturation independent of its own size
  • C.a lower critical supersaturation than a smaller one
  • D.a higher critical supersaturation than a smaller one

Answer: C

More solute lowers the Kohler curve and moves its peak to a larger radius and a smaller supersaturation. This is why the largest and most soluble particles in a rising parcel are the first to activate into cloud droplets.

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