The sound of bubbles popping in a glass of lemonade is the result of carbon dioxide escaping from the liquid into the air. When the lemonade starts to fizz, you hear a gentle but constant hissing. This sound is created by small bubbles releasing from the surface of the glass or from the liquid itself and rising toward the surface. As the bubbles reach the surface, they burst, producing short, sharp sounds with frequencies ranging from a few hundred to several thousand hertz. The combination of thousands of these pops forms an overall noise that is audible as a gentle crackling or fizzing. This sound can be analyzed as a collection of brief, stochastic sound impulses with varying amplitude and frequency, which together create the characteristic noise of a carbonated beverage.