Question

Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not?
A.
Helium has a higher density than air.
B.
Helium has a lower density than air.
C.
Helium increases the balloon's mass more than air.
D.
Helium has no mass, but air does.

Answers

There are no human answers yet.
Answered by GPT-4o mini
The correct answer is:

**B. Helium has a lower density than air.**

A helium-filled balloon rises because helium is less dense than the surrounding air. According to Archimedes' principle, an object will rise in a fluid (in this case, air) if it is less dense than that fluid. Since helium is lighter than the average air, the balloon filled with helium displaces a volume of air that weighs more than the weight of the helium contained in the balloon, resulting in an upward buoyant force that causes it to rise.

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