These are organized by a classification scheme developed exclusively for Cosma. More…
Fundamental Physical Constants (Institute for Chemistry and Biochemistry)
Physics, Constants, Units, & Uncertainty (NIST)
CODATA Internationally recommended values of the Fundamental Physical Constants (NIST)
CODATA Internationally recommended values of the Fundamental Physical Constants, Universal (NIST)
Physics Fundamentals (Martindale’s Reference Desk)
Physical constant, sometimes called fundamental physical constant or universal constant, is a physical quantity that is generally believed to be both universal in nature and have constant value in time. It is contrasted with a mathematical constant, which has a fixed numerical value, but does not directly involve any physical measurement.
There are many physical constants in science, some of the most widely recognized being the speed of light in vacuum c, the gravitational constant G, Planck’s constant h, the electric constant ε0, and the elementary charge e. Physical constants can take many dimensional forms: the speed-of-light signifies a maximum speed for any object and is expressed dimensionally as length divided by time; while the fine-structure constant α, which characterizes the strength of the electromagnetic interaction, is dimensionless. — Wikipedia
Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.
- Predicting the ocean: Improved forecast and...on June 4, 2021 at 4:29 pm
Marine forecasters face the challenge of predicting a very complex and constantly changing marine environment by applying ocean science, knowledge and technological skills to produce predictions of the state of the ocean.
- Reckoning with an animal that sees us as...on June 4, 2021 at 1:20 pm
The wet season in tropical Australia begins with tension. Physical tension, caused by the friction of earth and clouds. Mental tension, caused by the heat, and the expectation of rain and relief. It is also an ecological tension, where every plant and animal is poised—genetically, physiologically—to grow, reap, sow and copulate within a few short months.
- Smashing gold with finesse: Shockless compression...on June 4, 2021 at 12:52 pm
To test the Standard Model of particle physics, scientists often collide particles using gigantic underground rings. In a similar fashion, high-pressure physicists compress materials to ever greater pressures to further test the quantum theory of condensed matter and challenge predictions made using the most powerful computers.
- How quantum dots can 'talk' to each otheron June 3, 2021 at 5:07 pm
So-called quantum dots are a new class of materials with many applications. Quantum dots are realized by tiny semiconductor crystals with dimensions in the nanometre range. The optical and electrical properties can be controlled through the size of these crystals. As QLEDs, they are already on the market in the latest generations of TV flat screens, where they ensure particularly brilliant and high-resolution color reproduction. However, quantum dots are not only used as dyes, they are also […]
- Court case highlights how complex it is to...on June 3, 2021 at 1:20 pm
While today's pre-trial hearing over the Whakaari White Island tragedy revealed most of the 13 parties charged have yet to enter pleas, there is no disputing the basic facts.