Here’s Why A Bottle Of Beer Overflows When You Tap It

A spry tap on the top of a freshly - opened beer brings up a massive wave of fizz . This video let you see how that happens , and tells you what ’s happening inside the bottle .

Once a beer is opened , the major pressure - release has already materialize , so why does tapping the top with another bottle of beer make it erupt in foam ? The easy tap is n’t just a simple – or single – saccade . When one nursing bottle taps the top of another , it create a compression wave . That wave travels between top of the liquid and the bottom of the bottle , and it does so several time .

On the way , it creates chaos . Existing bubbles are compress and expound . In the process they cleave and , once again , expand . This keeps come about until the carbon dioxide in their general area is shaken out of the liquidness and traveling chop-chop towards the airfoil . Through this process , all of the carbon dioxide that should be exhaust slow as the beer slowly flattens over the course of an hr comes out in a few seconds and you get a fizz explosion .