I just don’t understand what’s happening to them. Everything I’ve read says the lower external pressure causes the helium inside the balloon to expand. Does this just mean the pressure inside the balloon is rising as if I blew up a balloon to far till it bursts? Why does the balloon expand?
In: Physics
Pressure air pressure outside the balloon gets considerably lower as you increase altitude, but the balloon has the same pressure as when it was inflated. So the pressure outside is less than the pressure inside and the balloon then expands until the pressure inside equals the pressure outside and the balloon will often burst before this hppens.
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