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Because in order to turn water into steam (liquid to gas) it must be heated intensely past the point of boiling, therefore the resulting steam is obviously extremely hot.

If you are referring to the danger of a catastrophic pressure vessel failure (boiler explosion) the danger comes from a three-pronged issue. Water under pressure will not boil at 212 degrees (100 C). As the pressure goes up, so does the temperature need to get the water to boil.

When a pressure vessel fails, there is the potential for an instantaneous drop in pressure from X pounds per square inches to ZERO psi. But of the water is (for example 350 degrees F) then without the pressure it will flash boil into steam. This is the thery of why locomotive boiler explosions were so deadly. It was common theory that when the firebox's roof sheet failed and the steam in the boiler evacuated into the firebox, the water flsah boiler, instantly raising the pressure to 50 to 100,000psi.

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13y ago

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