Would A Water Bottle Work As A Silencer?

Actually, the sound of an inflated balloon will be less than sound propagated through water.

The principles for underwater noise propagation differ from those above the surface. When you fill a plastic balloon with air and inflate it, you create an bubbles that almost completely isolate one bubble or pocket of air from another. These bubbles act as barriers between pockets of gas so they won’t produce sound waves that propagate outside the 2D elastic surface created by the pliable walls. On top of this is how these rubber balloons turn into an elastic lens that refracts (bends) incoming light beams at every conceivable angle because their curved shape causes them to act like lenses in addition to barriers – protecting whatever is inside the balloon.

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