 The corresponding equation for small bubbles of surface tension σ (and negligible liquid viscosity) is

Excited bubbles trapped underwater are the major source of liquid sounds, such as inside our knuckles during knuckle cracking,  and when a rain droplet impacts a surface of water.Injury by bubble formation and growth in body tissues is the mechanism of decompression sickness, which occurs when supersaturated dissolved inert gases leave solution as bubbles during decompression.The damage can be due to mechanical deformation of tissues due to bubble growth in situ, or by blocking blood vessels where the bubble has lodged.