Question

When the heat is on and the balloon is floating, how do the number of air molecules inside the balloon compare to the number of air molecules that would be occupying that volume if the balloon wasn’t there? If these are different, why doesn’t the balloon grow or shrink until they are the same?

b) Assume we have a hot air balloon with the same volume as the balloons in problem 2.

Answer 1

As I understand may you ask ...why not balloon sink and grow with flame of running burner.

So first you understand

Burner is for producing hot air because when we heated any of fuild then specific gravity will reduce and in atmosphere all the gases are arranged according to its specific gravity.

And may you also know hot air balloon is not totally cover from bottom of balloon.

So when burner produced hot air , and these hot air taken top most layer in side balloon and previous layer are push back down.

And same as all layers inside pushes all layers toward downwards sonmean atlast most layes have pushes out from balloon.

Soo the volume inside balloon are always constant.

And all these happen because of spacific gravity .