Why does a helium balloon go flat eventually?



  1. 0 Votes

    Helium is the second smallest atom after hydrogen. This is the reason that helium balloons float, the same volume of space contains less mass. It’s diminutive size also means that helium atoms can escape through microscopic holes in the material of the balloon itself, especially since it is under so much pressure. So even though the process is very slow, eventually the helium will escape.

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