Description
A needle can be pushed through a balloon without popping it by carefully inserting it through regions of the balloon where the rubber molecules are under the least amount of stress, typically near the tied end and the opposite pole. The surface tension of the balloon rubber allows the material to stretch and form a seal around the needle, preventing the balloon from bursting. This demonstrates the elasticity and strength of the balloon material and how surface tension can help maintain the integrity of a stretched surface.
PIRA DCS Number
2A10.150