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How do balloons pop?

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The air in a balloon is at a higher pressure than its surroundings because the elastic tension of the balloon skin is pulling inwards. When you ... out slowly. Likewise, the silvery, Mylar balloons that usually contain helium don't pop very well because Mylar is a pre-stretched plastic and so it isn't very elastic. read more

When you stretch an uninflated 260 like a rubber band, you straighten out and line up the molecules in the direction that you are pulling. When you inflate a round balloon, the molecules are stretched equally in all directions tangential to the balloon wall because the stress in all tangential directions is the same. read more

It's like stretching a rubber band all the way out, only in three dimensions instead of flat in two. If there is a weak spot anywhere, the tension on the rest of the balloon will suddenly rip its fabric apart, causing a pop sound and a deflated shredded balloon. Let's think of rubber bands again. read more

1) When you pop the balloon with a needle, the air inside tries to rush out (as it's in a high pressure in there). But, only a small area is provided by your needle (which is not enough for the air to rush out). The balloon begins to crack, thereby expanding the hole into a large fissure. read more

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