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.
Getting shot by police is a leading cause of...
on August 19, 2019 at 4:50 pm
About 1 in 1,000 black men and boys in America can expect to die at the hands of police, according to a new analysis of deaths involving law enforcement officers. That makes them 2.5 times more likely than white men and boys to die during an encounter with cops.
Where will evolution take us in the Fourth...
on August 19, 2019 at 1:42 pm
The study of evolution allows us to reconstruct the past and to understand how life evolved from simple to complex organisms. Evolutionary reasoning can help us make sense of the biggest questions in science, from the origin of the universe to the inner workings of the human brain.
A brief astronomical history of Saturn's amazing...
on August 15, 2019 at 1:10 pm
Many dream of what they would do had they a time machine. Some would travel 100 million years back in time, when dinosaurs roamed the Earth. Not many, though, would think of taking a telescope with them, and if, having done so, observe Saturn and its rings.
54 million year-old fossil flies yield new...
on August 15, 2019 at 12:09 pm
Fossilised flies that lived 54 million years ago have revealed a surprising twist to the tale of how insects' eyes evolved. These craneflies, unveiled in Nature today, show that insect eyes trap light the same way as human eyes, using the pigment melanin—yet another example of evolution finding similar solutions to similar problems.
One year, two trips around sun for NASA's Parker...
on August 13, 2019 at 1:15 pm
Since NASA's Parker Solar Probe launched on Aug. 12, 2018, Earth has made a single trip around the sun—while the daring solar explorer is well into its third orbit around our star. With two close passes by the sun already under its belt, Parker Solar Probe is speeding toward another close solar approach on Sept. 1, 2019.