What Causes the Sound of Water Unfilling From a Bottle?

[Thejas15101998]

When we unfill a waterbottle, we here a periodic sound like- cloc.. cloc.. cloc..- How does this happen?

 

[A.T.]

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?

 

[Thejas15101998]

yes i see bubbles of air going up.

 

[Thejas15101998]

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?

 

[Nugatory]

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?

 

[Thejas15101998]

Sound is disturbance in medium.

 

[Thejas15101998]

we can speak in terms of pressure or density variations.