Table salt (sodium chloride) enters its liquid state at temperatures above 1,400°F. When a crucible of molten salt is poured into a tank of water, it causes an explosion of steam and water. It is thought that the Leidenfrost Effect is partially responsible for the first few moments of this violent physical reaction as the molten salt rapidly boils water in its immediate vicinity to form a sheath of steam. However, the immense heat quickly overcomes this barrier and rapidly expands outwards causing a stream explosion.
Source: https://youtu.be/PDRWQUUUCF0 (backyardscientist)
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