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I was with you up until the last sentence. Molecules vibrate and pass some of that molecular vibration on to neighbouring molecules. It’s kinetic energy.
It only becomes sound when a listening device of some sort registers it (usually an ear, but could also be an insect leg, etc.).
Acoustic waves propagating through a medium (air) exist regardless of whether or not something can perceive it as audio. I would argue that the mechanical phenomenon we call "sound" (acoustic waves) exists regardless of whether or not someone hears it. Similar to how light (electromagnetic radiation) exists regardless of if someone is around to look at it.
That saying always seemed really stupid to me. Of course it makes a sound. Ugh
What we typically refer to as "sound" is the airwave, not the perception; at least in physics.
Sound is just a pressure wave propogating through any compressible medium, right? Though I think we are a bit inconsistent in how we use it. E.g. Almost no one calls the seismic waves from an earthquake a "sound".
yeah, human language can be a bit inconsistent/imprecise at times. That is why all tech and engineering have their own language: maths; where consistent and precise descriptions are possible.