Water at room temperature will boil when the surrounding air pressure drops below the vapor pressure. In this case the vapor pressure is about 20 mmHg (20 Torr). Eventually we see the water freeze.

This video has been edited. The total time for the water to go from room temperature to freezing was about 90 seconds.

The pump was actually running when we poured the liquid nitrogen into the cold trap.

Sorry about the inconsistent lighting.

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