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This invisible gas can float a foil boat

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Invisible gases aren't usually known for being terribly heavy, but sulfur hexafluoride is practically a heavy blanket in gas form. It is so remarkably dense that you can pour it into an empty fish tank and then comfortably float a lightweight foil boat directly on top of it. It looks completely like dark magic, but it's just heavy chemistry.

This invisible gas can float a foil boat
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