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Ah, the refreshing sound of a cool drink of water being poured. You might feel thirsty just thinking about it. Or, if you’re a scientist, you might feel curious.
Mechanical engineer Mouad Boudina and colleagues wanted to understand how the pouring conditions affected the volume of that enticing sound. The key, the researchers found, was how much the incoming stream of water rippled as it fell.
As a column of water falls, an effect called the Rayleigh-Plateau instability causes the smooth stream to form lumps and bumps before eventually breaking up into droplets. Those ripples impact the surface of the liquid, forming air bubbles that vibrate and produce sound.
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