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Old 04-21-2016, 08:15 AM
DesertDog DesertDog is offline
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Join Date: Oct 2002
Location: Mesa, Ariz.
Posts: 3,345
MRE heaters use a powdered iron and magnesium alloy in salt water to create jillions of short-circuited galvanic cells that according to Wiki generate about 50 kilojoules. Having used them, I can attest they emit a strong ozone smell; any hydrogen is undetectable. It would be difficult to harness that to ignite steel wool, though.