Bubble

Bubble A bubble is a bounded pocket of gas enclosed by a liquid or solid film, appearing in contexts from household Antoine Lavoisier experiments to astrophysical nebulae observed by Edwin Hubble. Descriptions of bubbles appear in the works of Aristotle, Archimedes, and later experimentalists such as Robert Hooke and Otto von Guericke, intersecting with studies by Leonardo da Vinci, Sadi Carnot, and James Clerk Maxwell. Bubbles are central to phenomena investigated by institutions like Max Planck Institute and Massachusetts Institute of Technology.

Etymology and definitions

The common English term derives from Middle English roots influenced by early modern naturalists; parallel terms appear in the writings of Galen and Hippocrates when describing bodily humors. Scientific definitions evolved through work by Daniel Bernoulli and Joseph Plateau who formalized the notion of a minimal surface and the mechanical equilibrium of lined gas pockets. In optics, Isaac Newton classified iridescent thin films produced by bubbles alongside rainbow studies associated with Christopher Hansteen and John Dalton. Legal and economic uses of the word were popularized in commentary after the South Sea Company collapse and the Tulip Mania historiography by Adam Smith.

Physical properties and formation

Formation mechanisms were elucidated in experiments by Joseph Priestley, Thomas Young, and Lord Rayleigh, combining surface tension described by Pierre-Simon Laplace with viscous flow treated by Ludwig Prandtl. Surface tension balances pressure differences via the Laplace relation used in capillarity research at École Polytechnique and Imperial College London. Film thickness interference producing iridescence was quantified in Augustin-Jean Fresnel's wave theory, later applied by Niels Bohr to thin-film spectroscopy. Bubbles nucleate on heterogeneities studied in the context of cavitation research by Sir James Dewar and in boiling curves characterized by Sadi Carnot-inspired thermodynamic analyses at University of Cambridge. The stability of spherical versus non-spherical shapes invokes Plateau's laws as formalized by Lord Kelvin and computationally explored by Josiah Willard Gibbs and Herbert A. Stone.

Types and applications

Floating soap films and foam have been optimized by chemists at Unilever and engineers at Procter & Gamble for consumer products; industrial foams are used by Royal Dutch Shell in flotation processes and by ArcelorMittal for metallurgical slag control. Bubbles in bubble chambers developed at CERN and detectors at Fermi National Accelerator Laboratory enabled particle tracking for experiments led by Donald Glaser and teams collaborating with Enrico Fermi's legacy groups. Medical imaging techniques harness microbubbles traced in studies by Mayo Clinic and Johns Hopkins University for contrast-enhanced ultrasound pioneered alongside work at GE Healthcare. In chemical engineering, gas-liquid reactors designed at DuPont and BASF exploit bubble columns and spargers informed by research at Massachusetts Institute of Technology and Technische Universität Berlin. In geoscience, volcanic vesiculation observed at Kīlauea and Mount Etna shapes eruptive behavior analyzed by researchers from USGS and University of Tokyo.

Cultural and artistic significance

Bubbles have been motifs for transience in the visual arts from paintings by Rembrandt and Jean-Baptiste-Siméon Chardin to late works by Jeff Koons and installations at Tate Modern. Literary treatments range from allegories in works by William Shakespeare, Jonathan Swift, and Charles Dickens to modernist meditations by Virginia Woolf and Jorge Luis Borges. Filmmakers such as Walt Disney and Hayao Miyazaki have used bubble imagery for wonder and fragility; stage designers for Cirque du Soleil productions deploy giant bubble effects engineered with inputs from Royal Society fellows. Street artists in Banksy-adjacent movements and performance artists like Marina Abramović incorporate ephemeral bubble sequences in public spectacles curated by institutions such as the Metropolitan Museum of Art.

Scientific research and modelling

Contemporary research spans experimental, theoretical, and computational domains. Direct numerical simulation of multiphase flows has advanced at Los Alamos National Laboratory, Sandia National Laboratories, and teams at Stanford University using methods developed by Claude-Louis Navier and George Gabriel Stokes. Mathematical models invoking the Navier–Stokes equations, surface tension terms inspired by Pierre-Simon Laplace, and interface-capturing schemes from work by Kenneth Georgiou and Sergey Osher underpin simulations used at NASA for propellant behavior and by European Space Agency investigations of microgravity foams. Lab-on-a-chip technologies using controlled droplet and bubble microfluidics are driven by research groups at ETH Zurich and Harvard University. Interdisciplinary projects link soft-matter physics from Institut Curie with biological studies at Cold Spring Harbor Laboratory to explore cellular mimics and protocell models inspired by Alexander Oparin's hypotheses. Recent breakthroughs include high-speed imaging contributions from teams at Rutherford Appleton Laboratory and machine-learning-based closure models developed at DeepMind collaborations with academic consortia.

Category:Fluid dynamics