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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The four most promising worlds for alien life in...
on September 18, 2020 at 1:40 pm
The Earth's biosphere contains all the known ingredients necessary for life as we know it. Broadly speaking these are: liquid water, at least one source of energy, and an inventory of biologically useful elements and molecules.
Scientists explore the potential for further...
on September 14, 2020 at 4:03 pm
A recent study suggested that we have probably approached the limit of predictability for tropical cyclone (TC) track prediction. If that's true, there's little we can do to improve TC forecasts as an incorrect position affects the utility of all other guidance, including wind, precipitation, and storm surge guidance. This would be bad news for disaster prevention and mitigation.
Lessons in green schoolyards benefit...
on September 11, 2020 at 2:00 pm
Amid one of the strangest back-to-school seasons in modern history, many teachers, parents, and caregivers are struggling to enrich their students' experiences beyond screen-based learning. A new study from University of Illinois researchers suggests daily outdoor lessons in green spaces could boost self-regulation in young children, setting them up for greater academic and social-emotional success.
Scientists map freshwater transport in the Arctic...
on September 10, 2020 at 4:18 pm
The Ob, Yenisei, and Lena rivers flow into the Kara and Laptev seas and account for about half of the total freshwater runoff to the Arctic Ocean. The transport and transformation of freshwater discharge in these seas have a large impact on ice formation, biological productivity, and many other processes in the Arctic. Researchers from Shirshov Institute of Oceanology and MIPT have investigated the spreading of large river plumes—that is, freshened water masses formed as a result of river […]
Physicists use classical concepts to decipher...
on September 9, 2020 at 5:36 pm
There they were, in all their weird quantum glory: ultracold lithium atoms in the optical trap operated by UC Santa Barbara undergraduate student Alec Cao and his colleagues in David Weld's atomic physics group. Held by lasers in a regular, lattice formation and "driven" by pulses of energy, these atoms were doing crazy things.