cmon .. gravity pull down the whole oceans .. and cant pull a helium??? u kidding me.. its mass and density.. coz hellium have less density goes up coz i lighter then air.also stop to goes up coz hit the firmament no place to go up.. and all rest have bigger mass goes down.. fuck gravity .. gravity does not exist its only theory.i don't believe in theory .
1) You didn't read a thing I said. You like facts right? Here's a fact: fly in a "vomit comet," an airplane that simulates zero-gravity environments, and all of a sudden a helium balloon won't rise to the ceiling in the plane's cabin. Note that neither the mass nor density of the balloon changes. In other words, something else needs to explain why the baloon rises when the plane is at rest, and why it doesn't rise when the plane dips at a specific angle at a given velocity.
What changes is the balloon's weight. According to laws of hydrostatic pressure, lighter liquids rise when immersed in heavier ones, which is why a helium balloon rises in our atmosphere. But, in a zero-gravity airplane (vomit comet), everything inside becomes weightless, so the balloon doesn't rise or fall -- instead, it "floats" along with everything else in the cabin.
In short, because w=mg and g=0 in a "vomit comet," then the weight of the balloon is w=0, and so it doesn't rise in the cabin despite being less dense than the air in the cabin.
Basically, to disprove my point, you need to show another formula for weight that doesn't involve 'g.' Unfortunately for you, you don't have one.
2) Gravity affects both oceans and helium balloons. But, so does hydrostatic pressure. If our atmosphere was lighter than helium, a helium balloon would also fall to Earth's surface. But, it's not, so the balloon rises. But, it won't rise forever. Once the balloon rises high enough to a point where the atmosphere is so thin that the laws of hydrostatic pressure no longer apply, the balloon will stop rising because the force of lift will reach equilibrium with the force of weight due to gravity.
3) Yes, you do deal with theory whether you like it or not. Any interpretation of data (facts) is a theoretical one. Facts alone don't tell us anything other than some data exists; theories tell us things.