sine wavesqualitative observations Less of the liquid touches the plastic, which in itself also vibrates. Bubbles appear after the frequency stopped.
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square wavesQUALITATIVE OBSERVATIONS The fluid folds in on itself. Blobs move together in vibrating bunches.
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Lab trials carried out by: Bernardo Gouveia, Darien Keyack, Karl Bastos, Lavy Chvaicer, Ugo Lecerf