What Causes the Sound of Water Unfilling From a Bottle?

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The periodic sound heard when water is poured from a bottle, described as "cloc.. cloc.. cloc..," is caused by air bubbles displacing water. As water exits, air enters the bottle to fill the void, creating pressure and density variations that produce sound. Observing the bottle's mouth reveals alternating moments of air and water, indicating that air is being pushed around. This disturbance in the medium generates the characteristic noise. Understanding this phenomenon involves recognizing the relationship between fluid dynamics and sound production.
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When we unfill a waterbottle, we here a periodic sound like- cloc.. cloc.. cloc..- How does this happen?
 
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Thejas15101998 said:
When we unfill a waterbottle, we here a periodic sound like- cloc.. cloc.. cloc..- How does this happen?
Have you tried looking at a transparent bottle during that process?
 
yes i see bubbles of air going up.
 
well i think that a certain volume of air thrives its way into the bottle to displace an equal volume of water. But why does that sound so?
 
Thejas15101998 said:
well i think that a certain volume of air thrives its way into the bottle to displace an equal volume of water. But why does that sound so?
Look carefully at what's going on right at the mouth of the bottle. You will find some points where there is air one moment and water the next and back again... So clearly some air is being pushed around. Now, what is sound?
 
Sound is disturbance in medium.
 
we can speak in terms of pressure or density variations.
 

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