It is true that sound can break glass, but it is
not as easy as it may look in the movies. The way
sound travels is that it makes things vibrate, so
either air molecules or water or whatever the
sound is traveling through. If you've ever seen
anyone run their finger around the edge of a wine
glass you may have heard it sing a note. This
sound comes from the 'resonant frequency' of the
glass --the vibrations of the particles making up
the glass. All glasses are a little different and
so have slightly different resonance frequencies.
It is this frequency that will break the glass.
So in order to break the glass you will need
something that will produce the same frequency of
sound as the resonant frequency of the glass.
This sound must be produced loud enough and long
enough for all the glass molecules to vibrate
enough to actually shatter the glass. I wouldn't
recommend trying this at home since the sound may
actually need to be so loud that it may cause some
damage to your hearing if proper precautions are
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