A science teacher sets a fireball off at a school in Sydney to warn others of the highly reactive replacement 'town gas' for helium in party balloons.<br /><br />The teacher, Jacob Strickling, explains that "town gas is very reactive and ignites in a big orange fireball. This reactivity makes it very dangerous to breathe in," unlike the helium gas normally used to make voices go high pitched and squeaky. <br /><br />The demonstration was shot on August 8.
