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Alcohol vapor mixed with air is super flammable. If the fuel/air
mix is just right, a cup (~250mL) could probably blow the roof off
of your house. At any rate, I've heard that a quarter cup of
gasoline, totally vaporized, and mixed properly with air, is
equivalent to one stick of TNT. I don't know how true it is, but I
think alcohol has at least 50% of the chemical potential energy as
gasoline, and it is easier to ignite.
Although my calculations do agree that alcohol has somewhere around
50% of the energy storage of gasoline and that gasoline is comparable
to TNT, I seriously don't think anyone needs to worry about
explosions removing roofs or windows from your home. It simply won't
happen with 30% water contamination using ambient air (versus a pure
oxygen atmosphere or a highly compressed, properly mixed internal
combustion engine). If you read various sites, such as [
http://www.violetwand.org/fire.htm ], there is evidence that people
ignite alcohol on their signficant others using Tesla wands in their
bedrooms/torcher chambers. If a human body can withstand an alcohol
fire, I should think a stove top/floor/etc. could as well (assuming
someone is actively paying attention to it).