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Think of a pressure cooker... The higher the pressure, the higher the boiling temperature. You need a vessel that will hold the pressure at 350C. Wikipedia gives a formula for the pressure need to get the boiling temperature of water up to a certain value. The formula is $$T_b=1730.53/(8.07131-\log_{10}P) -233.426$$ where $T_b$ is the boiling temperature ...


As mentioned in DumpsterDoofus's answer, those potentials are likely relative to atmospheric pressures but at magnitudes of 1 GPa that's pretty much irrelevant. It's the pressure of the gas vapor that determines equilibrium. The pressure of the liquid is nearly irrelevant, so in this case even if the capillary forces lowered the pressure below absolute ...

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