When I was younger, we played with the heating packets from MRE's (Meals, Ready to Eat - Military field meals). My favorite thing to do was to put a pouch inside a plastic container (with a screw-on lid), add water, tighten the top, and wait for the large boom.
Here's my question: The heaters release moderate amounts of hydrogen gas once water is added. Of course, with an enclosed container, it will quickly reach pressures adequate to blow a bottle apart (wear eye-wear). But once I joined the military we would add a flame source, so we could see just how large the blast was. I wasn't so sure that flame would actually add anything to the gas explosion. They were sure of it. Is anyone aware if: The presence of flammable gas (exploding from a plastic bottle) with an external ignition source would increase the blast? Or maybe just add another factor to it?
I'm sure somebody knows. Every once in a while, though I've been out of the military for about 4 years now, I still find it surfacing from my friends. Just curious.