Who will offer himself a glass of milk, grab the tetrabrick, and eventually splash all over the counter. This is something that usually happens on a regular basis, but there is a simple solution as it is overwhelming.
You’ve probably seen a lot of things on the internet. Tips and tricks videos where we learned we’re serving milk wrong tetra brick throughout our lives.
It would seem that the correct way to pour the milk is with the hole of the tetrabrik facing up, not down, as we usually tend to do. You might think it makes more sense to place the opening as close to the glass as possible to prevent spillage, but there’s a scientific justification for doing it the other way around. Why is it preferable to serve milk with the mouth facing up?
Why do we pour the milk wrong?
The explanation is very simple and has to do with the fact that: Gases always move from areas of high pressure to areas of low pressure.. When we pour the milk with the mouth at the bottom of the tetra brik, when the milk is poured, it fills all the openings and prevents air entry. As the milk empties, a small pocket of low pressure air forms inside the container.
This pressure difference between the ambient air and the air inside the tetrabride allows the outside air force itself to come in and balance the pressure. In doing so, it stops the flow of milk (partially or completely) and when the pressure equalizes, the milk flows again, causing a dreadful explosion that can eventually cause splashing.
And why doesn’t this happen with the mouth up?
This does not happen when the spout is up and the milk flows in an uninterrupted, regular flow. Reason? The main reason for this is that the carton does not completely close when we pour the milk, keeping the pressure balanced by allowing the air to move freely between the inside and the outside of the container.
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