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
If you blow something up, the only thing that determines when it will burst is the **differential** pressure, so the difference between the pressure on the outside and inside. This means you can cause something to burst _either_ by increasing the pressure inside _or_ by decreasing the pressure outside, because both increases the pressure difference.
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