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Originally Posted by AngryAlpaca
Heat pipes with water can actually go below zero. Well below zero in some cases. With liquids, the pressure is lowered, so they stay in liquid and gas forms for a wider temperature range.
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That's true for most liquids, however for water, as pressure is increased then water will remain a liquid at lower temperatures.
In fact, under a pressure of ~210MPa (~30500 PSI), water can remain as a liquid down to -22C.