I’m talking at least a cup of water, maybe a gallon or even more on Earth so you have gravity. No simulated weightlessness inside a descending plane either. The contained liquid should not be an aerosol, but a large mass of cohesive liquid.
What mediums are allowed for these waves? Because you can pump all the subsonic waves you want through my favorite Elmo glass and it will hold water just fine.
you’re saying sound or EM waves will push a blob of water on all sides sufficient to keep it from collapsing or spilling out?
i think you’re better off experimenting with directed air flow. remember how you can keep a pingpong ball or even a beach ball stationary in the air?
Air is the medium. The water should be surrounded by air.
You can have an open side on top as there is gravity. A cone would probably work.
So I don’t get it…are you answering your own question? Or just working your way through a homework problem…???
Can the sound wave have a DC component? Because otherwise, you’re just shaking the water up and down, and gravity will have its say in the end.
It’s just something I want to know. I’d like to know if it could be done. Add in anything you need, but don’t tell me the Elmo glass counts as it’s the cup and not the sonic wave that was holding the water in that case. Use multiple source points for the waves if it helps.
I don’t think you can. Sometimes the wave will produce an overpressure, but sometimes it’ll produce an underpressure, as cornflakes alludes to. The overpressure could probably hold water, in principle, but the underpressure phase would just suck, and make it even harder to hold than in still air.