It shows a raindrop starts as a sphere but bursts into a shower of smaller droplets within a few hundredths of a second.
Firstly the drop flattens out into a pancake shape. As the pancake widens and thins, the onrush of air causes it to hollow out, like an upturned bag.
The bag inflates beyond the ability of the water's tension to hold it together and shatters.
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