why do helium balloons fall - Search
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    Helium balloons float because helium is less dense than air. However, helium balloons eventually fall because helium atoms are small enough to slip between spaces in the balloon material, a process called "diffusion". The balloon material is usually Mylar and not rubber because there is less space between the molecules in Mylar, so the balloon stays inflated longer. Helium balloons are pulled by gravity, but they don't fall because there is another force acting on them, a buoyant force from air pressure that is equal to the weight of the air displaced by the balloon.
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