why does liquids “glug” when you pour them from a bottle?
In: Other
The Water is Escaping the bottle, but because the water is taking up all the space around the only opening in the bottle, nothing can enter the bottle to replace it (not even air). This creates an area of low pressure in the bottle which continues decreasing in pressure until it reaches a level of criticality.
At this point, air from outside the bottle is literally pulled in to the bottle at a greater force than the liquid trying to leave the bottle, it pushed the water out of the way to get in to the bottle. This is whaty creates the glugging sound.
Metaphorically speaking, the bottle is taking a huge breath, like you would need to after breathing out. You can avoid this by pouring slowly and leaving an area of air above the liquid level as is leaves the bottle.
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