When Max Koch opened a bottle of homebrew beer one afternoon in Göttingen, Germany, he wasn’t just cracking open a drink. He was launching a scientific experiment into one of the most familiar yet ...

When the "pop" sound happens, the gas in the neck of the bottle vibrates at a frequency of about 800 hertz, and the sound ...

"The pop's frequency is much lower than the resonation if you blow on the full bottle like a whistle," said Koch. "This is caused by the sudden expansion of the carbon dioxide and air mixture in ...