Sulphur Hexafluoride is actually heavier than air, leading to some very amusing phenomenon such as the voice change here.
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This one is a classic. Wasn't sure at first why he was wearing the safety goggles since he was just sucking gas into his lungs but after watching the hand stand they make sense.
Sulphur Hexafluoride, a gas that give you a very dark voice instead of helium that gives you a light "donald duck voice".
Jamie and Adam attempt to make an aluminum boat float in a fish tank full of sulfur hexafluoride in this clip from Mythbusters. Mythbusters airs Wednesdays at 9PM on Discovery Channel. For more info, visit: http://dsc.discovery.com/fansites/mythbuste...