How is it possible that gases (helium especially) can leave a balloon or even a high-pressure tank over time ?
In: Chemistry
Helium is the literally the smallest gas available. It leaks more through smaller holes than other gasses. Rubber are long molecules intertwined, with lots of space in-between it. Gasses will naturally leak. Even water will leak (water will evaporate, then diffuse through the rubber).
Metal tanks are better, but high-pressure will make it more likely that stuff still escapes.
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