When you first open a soda bottle, why does the wrapper crunch and loosen?!
When you first open a soda bottle, why does the wrapper crunch and loosen?
When you're opening a large fizzy drink bottle for the first time, why does the wrapper around it start to sound "fizzly" and appear loosened?
Answers:
Carbonation buildup causes the bottle to expand and when you open it the pressure is released. The noise you hear is the glue on the label detaching from the bottle along with the material shrinking back to it original form.