Liquid water at 400oC?

 

How do you get water to 400 oC?

Brocken Inaglory [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons

Easy, you superheat it…

Superheated water is found naturally on the earth in underground water supplies – we see it coming to the surface as a geyser. It is also found in man made phenomena such as power stations.

But how is it superheated?

The key ingredient is Pressure. The pressure stops the water boiling and keeps it liquid – if the pressure is reduced (such as the geyser rushing out of the earths crust) it will boil and cool down.

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