One needle, thumbtack, or pushpin can apply much more pressure on a concentrated area than a large group of 15-20 sharp objects can on the same balloon.
When the balloon is placed on 15 or more pins, the same amount of pressure that one pin was contacting the balloon with is now dispersed across a greater surface area of the balloon between all of the pins.
Because no single pin is pushing with as much force when they are grouped together, there is not enough force to pop the balloon and the balloon will seem unpoppable!
Dive deeper into the fascinating science behind this unpoppable balloon experiment right here: https://playingwithrain.com/balloon-a...
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