The key to how to open a beer bottle is actually the principle of lever. Ordinary bottle openers are secondary levers, with the fulcrum at the edge of the bottle cap. Gripping the handle to exert force is labor-saving and easy to pry. Like a strip blade, it is considered a primary lever, with the fulcrum also at the edge of the bottle cap, but you have to exert force downward, which is a little more difficult. The longer the handle, the less effort it will take. If the fulcrum is found correctly, it will be easy to pry without slipping. Another interesting phenomenon is that the “bang” sound when opening a carbonated beverage is caused by the sudden expansion of carbon dioxide and air, which causes the bottleneck to vibrate. The sound is loud but fleeting.