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The collision of drops with diameters ranging from 2.0 to 4.5 mm was studied with the velocity differences of the drop pairs equal to those observed in nature. Breakup normally occurred and produced 4.2 fragments on the average. The original two droplets reappear as the larger fragments with very little change in size, and the smaller fragments were formed by the disruption of a joining neck. The collision and breakup are, therefore, basically temporary coalescence. Changes in surface tension did not affect the results. Calculations demonstrated the high frequency of occurrence of such collisions in natural rain. The experimental and numerical data, if expanded, will help to solve the problem of warm rain formation.

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