CASE 1 (Isothermal condition)
If we increase the radius by a small amount, say  .
That will lead to condensation.
Vice versa
If 
That will lead to condensation.
Vice versa
That will lead to evaporation.
By similar analogy, one can show the solubility of a drop in comparison to flat surface.
Where  is the molar volume of crystal/drop.
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