Bottled mineral water froze in seconds on a metal bar in northern China.
The miraculous video, shot in the city of Anshan in Liaoning Province on November 25, shows a man slamming a bottle of water onto a metal bar on the roadside, seeing the water instantly freeze.
The phenomenon is called supercooling or undercooling, which is a process of lowering the temperature of a liquid below its freezing point and it requires the water to be pure.
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