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who needs explosives?

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SemperFiGuy:
Selective Demolition:

Propane and butane are heavier than air.   These gases sink to the basement.   Then Ka-boom from the bottom-up.

Natural gas is slightly lighter than air, even though it gets mixed w/propane and/or butane in some formulations.

So---natural gas rises to the highest level.   And then blows its top.

Can be spectacular, either way.

sfg

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