What decides how big water drops can become?
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Drops are held together by surface tension and pulled apart by air resistance. Also, the square-cube law operates to limit drop size. If you double the size of a drop then its surface area and wind resistance will quadruple (square law) but the volume and weight of the drop will go up by a factor of eight (cube law). So bigger drops will try to fall faster and get broken up by the air into smaller drops.
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