I mean, I understand that it’s difficult and has to be a very certain key at a specific volume, but I still don’t understand how that alone is capable of breaking a solid object. And why just glass? What about glass? Surely we can break other stuff too? I’m confused.
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A human voice can cause vibrations at a frequency that can create resonance in glass. The resonance magnifies the vibration until the glass breaks. This is usually done with very thin wine glasses for show. Humans can’t easily generate the frequencies to create the same kind of resonance in other materials with their voices.
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