I was wanting to store the HHO gas from my generator. I did an experiment where I filled a 2 liter plastic bottle full of the gas so it was under quite a bit of pressure, enough to make the bottle go solid. I then buried it underground so that the top of the bottle was 50cm beneath the surface. I had a tube in the bottle with an ignition source stuck in the other end. When I set it off, the ground shook very slightly and there was quite a muffled bang. It was more like a thud as if a large rock was dropped. Had the bottle been set off above ground, it would have made a terrifying loud bang which would be heard for miles around. The reason I am burying my tanks is so that if anything does go wrong, no one would notice. I will use 6 bottles buried at least 1 meter underground.
I recorded the experiment in slow motion here http://www.youtube.com/watch?v=kiSJ-n7kCtc
The problem is that hydrogen is lighter than oxygen so I would have hydrogen at the top and oxygen at the bottom of the bottle. and as I use the gas, my flame would go out as only oxygen is left.
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