This streaming video shows the fun that one can have with a gas, sulfur hexafluoride.
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Here's a neat trick demonstrating the density of sulfur hexafluoride--its more dense than the surrounding air, so the tin foil boat floats. Jay Leno tried the trick out and started drinking the gas, which has the opposite effect on the tone of your voice as helium does. Hilarity ensues.
Jay Leno…
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Oh, neat! I like the second demonstration.
Bob
That is way too cool! Really jazzes the (not so) inner nerd in me!