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
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Gravitational waves could soon provide measure of...
on October 22, 2018 at 9:16 pm
Twenty years ago, scientists were shocked to realize that our universe is not only expanding, but that it's expanding fasterover time. […]
A bridge to the quantum world
on October 22, 2018 at 2:00 pm
Monika Aidelsburger uses a special type of optical lattice to simulate quantum many-body phenomena that are otherwise inaccessible to experimental exploration. She has now been awarded an ERC Starting Grant to pursue this work. […]
Gravitational waves could shed light on dark...
on October 22, 2018 at 12:40 pm
The forthcoming Laser Interferometer Space Antenna (LISA) will be a huge instrument allowing astronomers to study phenomena including black holes colliding and gravitational waves moving through space-time. Researchers from the University of Zurich have now found that LISA could also shed light on the elusive dark matter particle. […]
A new way to measure nearly nothing: Ultracold...
on October 20, 2018 at 6:16 am
Many semiconductor fabricators and research labs are under increasing pressure from, of all things, vacuum. These facilities need to remove greater amounts of gas molecules and particles from their setups as new technologies and processes demand lower and lower pressures. For example, the vacuum chambers in which microchip manufacturers lay down a series of ultrathin layers of chemicals step by step—a process that must be utterly free of contaminants—operate at about one […]
Facebook's election 'war room' takes aim at fake...
on October 18, 2018 at 2:40 pm
In an otherwise innocuous part of Facebook's expansive Silicon Valley campus, a locked door bears a taped-on sign that reads "War Room." Behind the door lies a nerve center the social network has set up to combat fake accounts and bogus news stories ahead of upcoming elections. […]