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More on burning water

An interesting commentary from Nature.

It's easy to scoff, but if the effect is genuine then it is also genuinely intriguing. Plain tap water apparently doesn't work, but test tubes of salt water can be seen burning merrily with a bright yellow flame in the radiofrequency field. The idea, articulated with varying degrees of vagueness in news reports when they bother to think about such things at all, is that the field is somehow dissociating water into oxygen and hydrogen. Why salt should be essential to this process is far from obvious. You might think that someone would raise that question.

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This is not in itself to pass any judgement on Kanzius's claims; as ever, they must stand or fall on the basis of careful experiment. But the most fundamental, the most critical question about the whole business leaps out at you so immediately that its absence from these reports, whether they be on Pennsylvania's JET-TV or on PhysOrg.com, is staggering. Can you get more energy out than you put in?

I can answer that right now: no. You start with water, you break it apart into its constituent elements (hydrogen and oxygen), and then you recombine them by burning. Yes you can do that. Hydrogen, indeed, is the promised fuel of the new clean energy economy. But making hydrogen from water takes more energy than you can ever recover from burning it. Extracting net energy from this total cycle is impossible, if you believe in the first and second laws of thermodynamics. Otherwise, you have the basis of a perpetual-motion machine.

This jives with my own take... a fascinating result, perhaps an efficient method for converting electrical energy into hydrogen, but you can't get more energy out of a process than you put in unless the energy was already there, bound up in the material.

BTW: SciFi Techhas a video of the process in action