by Have a look at this video from a popular science Youtuber.
It shows how sound waves can generally pass through substances practically undetected. But, at just the right (resonant) frequency, they actually interfere significantly, creating interesting structures with quantum-like properties out of seemingly nothing!
Imagine the oil representing empty space (i.e. a vacuum) and the ethanol representing some lower density regions inside of it. (i.e. matter)
Note that both the oil and the ethanol have very fine-grained sub structures that eventually resolve to similar fundamental units we can use to express their relative densities, and through which waves can travel.
Also note how the internal structure (energy and density) of the two substances prevents them from just merging. It shows that two mediums can exist in the same space with fairly well defined boundaries. One medium appears relatively unaffected by the waves passing through it, while the other medium reacts spectacularly.
This experiment also supports the idea that matter is more energetic and lower density than empty space. We can see how the sound waves inject (trap) energy in the ethanol. Just look at the frantic movement of the emerging ethanol droplets. Specially around the edges.
The ethanol droplets exhibit all sorts of electron like behaviors. When droplets form or break up, they create “wave generating events” of their own, affecting the surrounding environment near and far. There’s a lot going on at different levels of detail. It’s not just the particles we see, it’s also everything we don’t see.
