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Physics

Scientists capture live, atomic-level detail of nanoparticle formation

Scientists at the Sensitive Instrument Facility of the U.S. Department of Energy's Ames Laboratory achieved real-time atom rearrangement monitoring using aberration-corrected scanning transmission electron microscopy during the synthesis of intermetallic nanoparticles (iNPs). In collaboration with Wenyu Huang, an associate professor... Continue Reading →

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Abel-prize winner Karen Keskulla Uhlenbeck built bridges between analysis, geometry and physics

U.S. mathematician Karen Keskulla Uhlenbeck has won the 2019 Abel Prize—one of the field’s most prestigious awardscfor her wide-ranging work in analysis, geometry and mathematical physics. Uhlenbeck is the first woman to win the 6-million-kroner (U.S.$702,500) prize, which is given... Continue Reading →

Bekenstein-Hawking entropy

The Bekenstein-Hawking entropy or black hole entropy is the amount of entropy that must be assigned to a black hole in order for it to comply with the laws of thermodynamics as they are interpreted by observers external to that black hole. This is particularly true for the... Continue Reading →

The low-Reynolds-number gravitational settling of a sphere through a fluid interface

What is Reynolds number?The Reynolds number is an important dimensionless quantity in fluid mechanics used to help predict flow patterns in different fluid flow situations. Magmas typically consist of a mixture of molten liquid, bubbles, and solid crystals. As they... Continue Reading →

Shock waves interacting between two supersonic aircraft

This week NASA released the first-ever image of shock waves interacting between two supersonic aircraft. It’s a stunning effort, requiring a cutting-edge version of a century-old photographic technique and perfect coordination between three airplanes – the two supersonic Air Force T-38s and the NASA B-200 King... Continue Reading →

The Surfactant-free Persistence of Surface Bubbles in a Volatile Liquid

Bubbles don’t stick around in pure water. Surfactants are needed to stabilize the thin liquid film for longer than the blink of an eye. But that’s not necessarily the case for other liquids. As the video below shows, a bubble in isopropyl... Continue Reading →

Behind…blue eyes

Because air and water are colorless and transparent, we cannot see most of the flows around us – but they’re always there. In a recent series, photographer Jess Bell has been capturing images of jumping dogs trailing a colorful powder... Continue Reading →

Scientists develop first fabric to automatically cool or insulate depending on conditions

Despite decades of innovation in fabrics with high-tech thermal properties that keep marathon runners cool or alpine hikers warm, there has never been a material that changes its insulating properties in response to the environment. Until now. University of Maryland... Continue Reading →

How Black Holes Nearly Ruined Time

"If black holes truly had no entropy, then any time an object fell into a black hole, its entropy would effectively be deleted, reducing the entropy of the universe and violating the second law of thermodynamics." Black holes are mystifying... Continue Reading →

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