Bubbles (physics)

thumb|upright=1|right|Cavitating propeller model in a Water tunnel (hydrodynamic)|water tunnel experiment

thin film of soapy water enclosing air

globule of one substance in another, usually gas in a liquid

right|thumb|Single-bubble sonoluminescence – a single, cavitating bubble Sonoluminescence is luminescence induced by sound waves, such as in the emission of light from imploding bubbles in a liquid when excited by sound. Sonoluminescence is sometimes considered a kind of mechanoluminescence. However, mechanoluminescence is typically defined as pertaining to solids, while sonoluminescence usually pertains to liquids. The related terms acoustoluminescence and sonotriboluminescence have been used to describe sound-induced luminescence in solids (e.g., crystals suspended in slurries).

pliable transparent plastic material

type of chewing gum

characteristic number for bubbles or drops in a liquid or gas, respectively, under the influence of gravitational an viscous forces

dimensionless number in fluid dynamics

ratio of grain collision stresses to viscous fluid stresses

thumbnail|Submerged antibubbles of air surrounded by soapy water thumb|Cluster of antibubbles on the surface of soapy water

set of mathematical rules governing the structure of soap films

filled bathtub

Laplace pressure

application of the rapid collapse of bubbles induced by sound waves

thin layers of liquid surrounded by air

is a 1923 Japanese nursery rhyme (warabe uta) composed by Shinpei Nakayama with lyrics written by Ujō Noguchi. It is widely taught in Japanese nursery schools and kindergartens as a simple melody; it is also sometimes used in elementary school moral education courses, where students learn that it is a meditation on the death of a child.