We are told since we are little kids that sounds are produced by vibrations/waves, these vibrations travel through a medium, such as air, until it reaches our ears, or until the vibrations lose strength and dissipate with distance. But what exactly causes these vibrations? Is it only the particle properties of electrons that cause the vibrations through pressure? or are the wave properties of electrons the ones that interact, also through pressure, with the waves of other objects or mediums producing the vibrations/sounds? Is it possible that because of the wave/particle duality that have been observed in electrons, and not only because of the particle form of electrons, both are what produce vibrations, but mostly because of the interaction of the wavelike properties between the electrons of two objects or mediums? BTW, haven't waves also been observed to have some particle properties? If I am right, the "particle properties" of waves and particles cause pressure between electrons, and the "wave properties" of both waves and particles interact with each other producing vibrations.