Does not really explode as the ballon contains mainly hydrogen... mmm there is another experiment where you fill a tin with H with a hole in the top and a hole in the bottom of the tin.. light the top hole and stand back as the chamber mixes air with the hydrogen.. bang.
I tries lighting the bottle once having placed a cork and a jet in the openning..dam there was air in the bottle..bang. My parents took my chemistry set away for a while after that... as they did when I busted a ballon filled with ammonia gas in the house one day.
alex
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