Question

why the bursting sound of balloon is different in empty room​

Answer 1

Answer:

This is discussed in Panda et al., "Why Balloons Make a Loud Noise When They Pop," International Journal of Acoustics and Vibrations (2019) and the references within. The authors conclude that the sound arises primarily from the "vibration of the balloon surface and the ruptured edge of the latex". Some of the other answers on this thread address the sound pressure resulting from immediate gas expansion. However, Panda et al. observed using shadowgraph imaging that the expansion was too slow for this explanation to be valid ("There is also no evidence of compression waves emanating from the expanding gas at the breach in the latex."). Indeed, the pressure waves were observed to be shed from the balloon skin.

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