Freezing liquid Nitrogen.

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(C)Properties of Heat and Matter - C+80: Triple Point

Solid Nitrogen: Liquid Nitrogen freezes under vacuum. Liquid Nitrogen is placed in a shallow pyrex dish inside a heavy-walled black aluminum cylinder with a thick flat glass top. The vacuum pump lowers the pressure, causing the nitrogen to freeze in about 3 minutes. TV monitor shows Nitrogen freezing. TRIPLE POINT.
UCB Index: 
C+80+2
PIRA Index: 
4C20.40
Demo Diagram: 

UCB Taxonomy:

PIRA Taxonomy:

Video: 

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C+80+5 Triple Point demo: Water boils under vacuum making ice.