Why the Milk Tetrapak Is Poured a Certain Way
A simple kitchen moment can turn into a spill fest. Someone might reach for a glass, grab the tetrapak, and end up spraying milk across the counter. It happens more often than you’d think, but there’s a straightforward fix that makes this mess disappear.
Relating to
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People scroll through endless tips and tricks online about pouring milk. Some clips suggest innovations that challenge long-held habits, hinting that we’ve been pouring from tetra bricks all wrong, for years.
The common belief is to tilt the container so the opening faces up toward the glass. It might seem logical to place the mouth near the cup to reduce drips, but there is a solid science behind pouring with the mouth up. So, why is it better to serve milk with the opening facing upward?
Why is milk poured with the mouth up?
The reasoning is simple and tied to air pressure. When the tetrapak is poured with the opening at the bottom, milk flows through openings and can close off air entry. As milk leaves the carton, a small pocket of low-pressure air can form inside.
That pressure gap between the outside air and the air inside the container lets outside air push back in to equalize pressure. The result is a temporary halt in the milk stream, and when the pressure normalizes, the flow resumes—sometimes with an unwanted splash on nearby surfaces.
Why does this not happen when the opening is up?
With the spout facing upward, the flow remains steadier. The container does not seal off air completely, allowing air to circulate in and out. This balance keeps the stream smooth and reduces sudden bursts of milk escaping the cup or counter.
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