| By slow pouring, you're reducing the distubance, not the pressure drop.
A slow ascent is more analagous to opening a screwtop slowly.
In the case a beer tin, you have remove all of the pressue at once, when you pop the lid.
So the slow pouring is more like a rapid ascent followed by laying down, whereas fast pouring is like a rapid ascent, then climbing a boat ladder followed by a 100m sprint.
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