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Saltwater on Fire
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Author:  Occupant [ Sun Dec 02, 2007 1:34 am ]
Post subject:  Saltwater on Fire

Anybody know if this reaction is exothermic?

http://www.cnn.com/2007/TECH/science/11 ... index.html

Author:  Pi [ Tue Dec 04, 2007 5:23 pm ]
Post subject: 

Not if it requires a greater input of energy in radio waves than you get out in heat.

The article didn't say what happens to the flame if you turn the radio waves off. I suspect it goes out immediately.

Author:  Attilla [ Sat Dec 08, 2007 3:03 pm ]
Post subject: 

Hmm. Could theoretically be using radiowaves to generator enough energy to split water, or possibly some form of photochemical reaction which excites the water molecules that they split when they get rid of their excitation. Could also somehow involve the sodium in water getting burned but that's the wrong colour for that. It might be the wrong colour for hydrogen burning, I forget what that was.

Author:  richv [ Sat Dec 19, 2015 2:23 am ]
Post subject:  Re: Saltwater on Fire

Occupant wrote:
Anybody know if this reaction is exothermic?

http://www.cnn.com/2007/TECH/science/11 ... index.html


It's endothermic. The radio waves photo-dissociate the water into hydrogen and oxygen. This takes exactly the same amount of energy that the oxidation would produce. Since the conversion of radio waves to energy in the water cannot be perfect, it takes much more energy than it produces. :lol:

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