Why does water go gluglugglug when we pour it too fast? Will it take a shorter time to empty the container if we pour a bit slower?
In: Physics
Imagine pouring water out of a bottle. This was probably what you thought about because it happens mostly with bottles, I have never seen it happening with a bucket.
So, there is a small opening and bigger space behind that little hole. If you pour water holding the bottle in about 90°, half of the hole is filled with water, and half is filled by air. Both are flowing, there is nothing to stop them, it’s easy for them to change places.
But if you tilt the bottle so the whole opening is covered with water, there is a little… battle. Water is trying to escape from the bottle but another end of the opening is covered with air, which creates a “wall” that the water is breaking rather easily because it’s heavier. It’s harder to the air and the water to change places because they are in the way of each other. A little bit of water breaks through the air wall, so a bit of water goes out od the bottle, creating space for air to get in. It creates a bubble. And again, and again. That process makes the gluglugglug sound and also the feeling of the bottle moving like glugglugglug. It’s about pressure. As soon as there is too few water to cover the opening, it stops gluglugglugging because both the air and the water can flow and change places easily.
It’s really easy to imagine if you think about humans! If there are two big rooms connected with a narrow corridor, and there are people in both rooms and they need to change places.
If there is one person in room A, and one person in room B, they can easily pass next to each other in the corridor and.
If there is a lot of people in both rooms and they change places slowly, let’s say 5 people of each group going calmly through the hall, it’s easy.
If they want to change places instantly and both groups are rushing to the narrow corridor, they will bump onto each other and it will be hard to move, but they would gluglugglug a bit (lmao) and they would finally change places. As there is fewer and fewer people in the corridor, it’s becoming easier to go through it and there is no need to mess with anyone.
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