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 CommonsEasy, 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 ...