Triple Point demo: Water boils under vacuum making ice.

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

Triple Point: Water boils under vacuum, making ice. Water is placed in a watch glass atop a beaker of sulphuric acid inside a heavy-walled black aluminum cylinder with a thick flat glass top. The vacuum pump lowers the pressure, causing the water to boil; the water then freezes very quickly. TV monitor shows water freezing. TRIPLE POINT.
UCB Index: 
C+80+5
PIRA Index: 
4C30.15
Demo Diagram: 

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C+80+2 Freezing liquid Nitrogen.
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