This video includes an explanation of density using practical exams. Density is mass per unit volume.

Technology advances: the energy density of lithium-ion batteries has increased from 80 Wh/kg to around 300 Wh/kg since the beginning of the 1990s. (Courtesy: B Wang) Researchers have succeeded in ...

So the extreme-density cells recently tested in Beijing ... This has now been smashed by a team from the Institute of Physics at the Chinese Academy of Sciences. A small team developed a ...

This article reports on research described in a paper in Nature Communications that was retracted on 23 October at the request of its authors due to an error in ...

Dark energy takes up roughly 70% of the energy density of the entire cosmos ... Paul received his PhD in Physics from the University of Illinois at Urbana-Champaign in 2011, and spent three ...