Question

I will mark u BRAINLIEST.if uanswer this question and the question is a balloon filled with hydrogen gas when released into the air goes up for a while but after sometime it stops.pls answer this question with the law or theory orbexplainations.pls don't give me any frivolous answer.answer to the question above

Answer 1

Because at high altitude air is thin.

Answer 2

This property is commonly referred to as Buoyancy.
Hydrogen acts as the second lightest Lifting gas, Hydrogen being the lightest.  Unfortunately H2 tends to have the undesired property of being very flammable in the standard atmosphere, which would make party balloons even more "exciting" when introduced to the candles on a birthday cake!
And also due to high altitude