Originally Posted by nerd
Which is probably another reason they shouldn't allow balloons: fill them with H instead of He and you've got a nice litte explosive device.
A hydrogen ballon will not explode. It burns quickly but quietly (other than the popping noise like any ballon, which depends on the partial pressure).
Look at the tape of the Hidenberg -- it didn't go "KABOOM!"; it burned like a house made of newpaper.