Re: OT: I did my good deed for the day.

Posted by MarkB_MI on July 14, 2007 at 04:21:30 from (216.234.123.31):

In Reply to: Re: OT: I did my good deed for the day. posted by Farmall MD on July 13, 2007 at 01:23:29:

By "hotter", I mean that 250 degree steam contains more energy that 250 degree water. This energy is called the "heat of vaporization", or more correctly the "enthalpy of vaporization". The heat of vaporization is the energy that has to be added to a substance at its boiling temperature to change it from liquid state to vapor. For water, the heat of vaporization is around 965 Btu per pound.

When superheated water in a cooling system is depressurized, the water has to change state from liquid to water. It does this by rapidly absorbing heat from the surrounding material. When the resulting steam comes in contact with your skin, it changes state again back to water, releasing the energy it picked up when it turned to steam. This energy is what causes steam burns to be so severe.

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