Triple Point demo: Water boils under vacuum making ice.

4C30.15 • C+80+5

diagram for demo

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.

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