A Balloon Question - Answer

A Balloon Question - Answer = C

Although it may seem contrary to our intuition, the smaller balloon actually forces air into the larger balloon. The smaller balloon has a smaller radius of curvature, therefore when the balloon's tension (elastic force) is broken into components parallel (tangential) and perpendicular (radial) to the surface , it can be seen (see diagram below) that radial component of the smaller balloon is greater than the radial component of the larger balloon. The result is that the internal pressure is greater in the smaller balloon than in the larger balloon. Therefore, the smaller balloon will force air into the larger one. 


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