why does a baloon filled w/ helium travel up? why does it stop? does this corelate w/ air presure or temp? how

Answer 1

The density of helium is less than that of air. It eventually stops because the higher the elevation, the less dense the air. It will stop when the density of the helium is equal to that of the air.

Helium takes up more space at higher temperatures, like all gases- thereby decreasing its density. Helium takes up less space at higher pressures - thereby increasing its density.

density = mass / volume

Answer 2

helium is lighter than air. It doesn't stop until the inside gas and outside atmosphere are at same pressure. If the helium is used it can also go up so far that the pressure on the outside is low enough to burst the balloon or whatever device the helium is in

Answer 3

Helium is less dense than air at low elevations. That is why it goes up. But as you get higher, the air becomes less dense. When the air becomes less dense than helium, it ceases to rise.