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It is a gas that weighs 6 pound. sulfurhexafluoride

helium weighs -6 pounds. that's why when you inhale helium, your voice goes up. and when you inhale sulfur hexafluoride your voice is weighed down to a lower voice. it sounds awsome.

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13y ago

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The opposite of helium would be a heavier gas, such as xenon or radon, which have a higher atomic number and density compared to helium.

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10mo ago
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Q: What is the opposite of helium?
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