Sulphur Hexafluoride is 6 times heavier than air (Video) 1 discussions You've heard how it sounds to talk after huffing helium, imagine your voice doing the opposite! Tags: helium sulphur hexafluoride hexaflouride voice slow deep video
	Preston and Steve- Sulfur Hexafluoride Rocks (Video) 1 discussions Check out the funniest flashback from Preston and Steve's Science Day 2007- Fun with Sulfur Hexafluoride! The Lowest Voices on Radio Preston & Steve on 93.3 WMMR www.prestonandsteve.com www.wmmr.com.. Tags: science day preston steve sulfur hexafluoride sf6 low voices laughter franklin institute deep river