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Where Champagne Gets Its Sound January 19, 2021• Freefly/stock.adobe.com × Hold a glass of champagne to your ear, and you will hear a gentle hissing sound, which comes from tiny bubbles bursting at the liquid’s surface. But what mechanisms produce the properties of the sound we hear such as its frequency spectrum? Juliette Pierre and colleagues at Sorbonne University in France now have an answer, finding that it comes from vibrations of the bubble cavity that are triggered by the bursting process [1]. While the result certainly has a fun aspect, the finding could allow scientists to use sound recordings to infer the volume of gas a bubble evacuates when it pops, the researchers say. ....
Common Ground in Avalanche-Like Events January 14, 2021• Physics 14, 6 Physicists have spent decades uncovering similarities in how disordered materials deform. Now they are trying to apply these results to the design of new materials. nakimori/adobe.stock.com Similar scaling patterns are seen in the sizes of avalanches on a snow-covered mountain and in the loudness of crackling sounds in deforming metals. nakimori/adobe.stock.com Similar scaling patterns are seen in the sizes of avalanches on a snow-covered mountain and in the loudness of crackling sounds in deforming metals.× Karin Dahmen loves noise. A theoretical physicist at the University of Illinois at Urbana-Champaign, she has spent most of her career studying the “crackling noise” emitted by different materials when they deform. The noise emitted when a piece of paper is crumpled, for example, is a series of discrete snaps that vary in loudness. If you were to plot the numbe ....
The Venus Phosphine Debate Continues December 22, 2020• Physics 13, 201 Researchers remain divided on the possible discovery of phosphine on Venus, a finding that could have implications for whether life resides on this nearby planet. NASA/JPL-Caltech × Life might exist beyond Earth, at least so claimed headlines across the globe in September touting possible signs of a gas called phosphine in the atmosphere of Venus. As all of Earth’s naturally occurring phosphine is produced by microbial life, the astronomical observations of the gas, reported by Jane Greaves at the University of Cardiff, UK, and colleagues, opened the door to speculation of microscopic Venusians floating in the planet’s clouds. But a flurry of papers appeared soon after on the arXiv preprint server questioning the result. This debate received airtime earlier this month at the 2020 American Geophysical Union Fall Meeting, where Greaves presented an updated analysis of the te ....
Vibrating Fluids Contain Hedgehogs Physics 13, 200 Swirling vortices and prickly hedgehog shapes are among the new patterns seen when a fluid containing floating particles is vibrated. H. Alarcón et al. [1] Spiky waves. Researchers have observed hedgehog-like patterns of particles floating amid currents that form near the surface of a vibrated fluid (see videos below). H. Alarcón et al. [1] Spiky waves. Researchers have observed hedgehog-like patterns of particles floating amid currents that form near the surface of a vibrated fluid (see videos below).× When Héctor Alarcón, at O Higgins University, Chile, and his colleagues set out to study the forces that act on particles moving through the fluid in a vibrating tank, hedgehogs were the last thing on their minds. Hundreds of other researchers have conducted similar experiments, observing various patterns, yet Alarcón and his colleagues saw something new: patterns that resemble this spi ....