Question

explain why a closed balloon filled with helium gas rises in air

Answer 1

Answer:

The helium gas in the balloon is lighter and less dense than the air outside the balloon. This makes a helium balloon rise up. The balloon will stop ascending if the balloon reaches a height where density of air is nearly equal to the density of helium gas within the balloon.

Explanation:

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Answer 2

Answer:

Here is ur answer... Mate,

Explanation:

This is because of the relative density.

As you know that the relative density of helium is less than the relative density of air... So that the balloon filled up with helium gas rises in air...

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