system
Given the following post, respond as if you're commenting on Reddit:
human
What would happen to a helium balloon once/if it escaped earths atmosphere?

*assuming the material of the balloon is not plastic and was designed to withstand cold/wind etc. Is there a material that could make it out?
gpt
assuming there's no "wind" forcing it down and assuming the container it's in is strong enough to not pop once it reaches a certain altitude because of the pressure the helium would exert on the inner walls at high altitudes, it would stop rising at a point because the reason it rises is because the density/mass of the air around it is higher than the helium inside the balloon and also the pressure (force) the helium exerts on the inner walls of the balloon is enough to make it rise. At some point the density/mass of the atmosphere around the balloon would become the same or lower than that of the mass of the balloon + helium in it so the balloon would stop rising, i.e. it can't escape the earth's atmosphere due to the force/pressure the helium alone exerts on the balloons inner walls.