Scientifically impossible... outer space vacuum
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In this specific case, you have laid out nothing wrong with the standard model. Helium (for balloons etc) is harvested from the ground, where it is kept under pressure. If any helium makes it to the surface, it will, through buoyancy, eventually leave the atmosphere.
https://en.m.wikipedia.org/wiki/Outgassing
Great we are in agreement then. Gravity has zero effect on helium molecules.
Not quite, it just has more effect on O2 and N2 (far larger) molecules than He molecules (far smaller).
Thus the heavier molecules are held closer to the surface, and the smaller molecules, through buoyancy, settle near the top of the atmosphere. But what’s this...gravity is weaker at a distance, and weaker on lighter molecules, and thus the helium at the top of the atmosphere can outgas.
Does that make sense or do you need a youtube video meant for children?
The gravitational force between two objects is based on 3 things: the mass of the first object (earth), the mass of the second object (gas molecule) and the distance between the objects’ center of mass.
O2 and N2 are heavier molecules (larger mass) than He. Helium gas is “affected” by gravity, just less than something heavier.
I leave the youtube video watching for children to you.