What Causes the Sound of Water Unfilling From a Bottle?

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Discussion Overview

The discussion explores the phenomenon of the sound produced when water is poured out of a bottle, focusing on the mechanisms behind the periodic sound and the interactions between air and water during the process.

Discussion Character

  • Exploratory, Conceptual clarification, Technical explanation

Main Points Raised

  • Some participants observe that bubbles of air rise when water is poured from a bottle.
  • One participant proposes that air enters the bottle to displace the water, questioning the reason behind the sound produced.
  • Another participant suggests that the sound may be related to the alternating presence of air and water at the mouth of the bottle.
  • There is a mention of sound being a disturbance in a medium, with further discussion on pressure and density variations.

Areas of Agreement / Disagreement

Participants express various hypotheses about the sound's origin, but there is no consensus on a definitive explanation or model for the phenomenon.

Contextual Notes

Some assumptions about the nature of sound and fluid dynamics are not fully explored, and the discussion does not resolve the specific mechanisms at play.

Who May Find This Useful

Individuals interested in fluid dynamics, acoustics, or the physics of sound may find this discussion relevant.

Thejas15101998
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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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