Chinese scientists break a historic barrier and achieve the highest plasma density in a nuclear fusion reactor.

Pollutant particles with a smaller diameter, density, and flow rate can enter the deep lung, but large particles with a low density may also enter the deep airways, according to a study. Researchers ...

China breaks a historic barrier in nuclear fusion, bringing the dream of nearly infinite energy closer to reality.

Powder is a collection of single solid particles, which in most cases may be considered a basic unit. Powder is typically comprised of solid particles, interparticle voids, as well as open and closed ...

Sound has negative mass, and all around you it's drifting up, up and away — albeit very slowly. A phonon — a particle-like unit of vibration that can describe sound at very small scales — has a very ...