The solution is to pour such that the liquid never fully blocks the hole. With containers where the exit hole is offset, such as oil cans and some milk cartons, pour with the hole upper most. If it is at the bottom it is nearly always blocked by liquid but at the top it will start off in the air space and stay partially in the airspace if you pour carefully.
-
John say: It's because when the milk comes out of the opening, it temporarily creates a vacuum behind it within the container and this tries to prevent any more milk coming out. However, because nature abhors a vacuum, air quickly does its best to rush in via the same opening any way it can to remove this vacuum These two process occur simultaneously each moving in opposite directions but trying to do so through the same opening. When the milk is poured at 45 degrees say, it temporarily blocks the opening and no air can get in and its only when the air "sees" an opening that it rushes in to release the vacuum, before the milk blocks the opening again. This cycle repeats causing the the milk coming out in "waves" and giving the Glug Glug Glugs...sounds. The size of the opening is important too, the larger you can make it, the greater will be the opportunity for milk and air to pass one another simultaneously. Another more simpler way to avoid all this is to pour the milk out more slowly at a shallower angle! Or, better still, somehow, without making a mess everywhere, create a separate opening somewhere at the top of the container (as its poured) to allow the air to come in at a separate location.
You sound a bit, "ham-fisted", slow down mate!- just pour it out slower!
-
Samwise say: Ok, so let's first consider your milk example.
When you pour milk, milk comes out of the jug. (duh). But when the milk comes out, something else must fill the area it left.
Air is the only thing available to fill that area, so air rushes into the jug. The air has to push the milk out of the way to get inside, so the milk makes regular pauses as air rushes in.
This is why it does that "splosh splosh splosh" thing.
-
TBK say: i think it has to do with air pressure
-