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Why does a ballon filled with helium rise while a ballon filled with an equal volume of average atmospheric Air does not
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Why does a ballon filled with helium rise while a ballon filled with an equal volume of average atmospheric Air does not

User Awmleer
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A balloon inflated with helium has less total mass than the air it displaces; its weight (and average density) also are less. Therefore the force exceeds the weight force, the net force on the balloon is upwards, and the balloon rises.
User Lilla
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