How does Helium escape from party balloons?
In: Physics
Helium atoms are smaller than the molecular make-up of the ballons. They in essence slip between the cracks. Add to that that most traditional ballons are elastic and forced to expand under pressure meaning the helium is always trying to find a way to the lower pressure on the other side of the balloon wall.
Mylar balloons on the other hand are made up of material more impervious to the leaking Helium. Add that they are mostly pre-inflated, so once enough helium leaks out they can hold the gas at a much lower pressure.
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