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Perhaps you have attended a party where balloons floated. A balloon filled with air does not rise above your head, but a balloon filled with helium gas rises in the air to the end of its string. What does
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Perhaps you have attended a party where balloons floated. A balloon filled with air does not rise above your head, but a balloon filled with helium gas rises in the air to the end of its string. What does this tell you about the density of helium?

User Dwayne King
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Helium has a low dense than air
User Z M
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