Physical Constant

Cosma Home > Communication > Knowledge > Realm > Physical > Constant




Physical Realm
Physical Laws (Constants) Relativity
Matter Molecule, Atom (Periodic Table), Particle
Force Gravity, Electromagnetism (Light, Color)


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

Encyclopædia Britannica
Physical Constants (Eric Weisstein’s World of Physics, Wolfram Research)


Physical Constants (Wolfram Alpha)


WorldCat, Library of Congress, UPenn Online Books, Open Library

News, NPR Archives






More… - latest science and technology news stories internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Self-organization of nanoparticles and molecules...
    on April 30, 2021 at 3:10 pm

    Chemical organization in reaction-diffusion systems offer a strategy to generate materials with ordered morphologies and architecture. Periodic structures can be formed using molecules or nanoparticles. An emerging frontier in materials science aims to combine nanoparticles and molecules. In a new report on Science Advances, Amanda J. Ackroyd and a team of scientists in chemistry, physics and nanomaterials in Canada, Hungary and the U.S. noted how solvent evaporation from a suspension of […]

  • Six out of every 10 teachers believe that...
    on April 29, 2021 at 4:53 pm

    The image of rows of chairs and desks facing a teacher at a blackboard has been a reality for decades. However, research reveals that this way of organizing the classroom furniture in schools is not the best way for favoring the learning process. Especially if the needs of 21st-century students are taken into account, who, according to the OECD, require a social environment that fosters autonomy, flexibility, decision-making capacity and the connection of knowledge by individual students or […]

  • Lofted by NASA balloons, new experiments will...
    on April 29, 2021 at 1:14 pm

    A suite of scientific balloons is about to lift off from NASA's Columbia Scientific Balloon Facility's field site in Fort Sumner, New Mexico, carrying instruments that will help scientists understand the connection between the Sun and Earth.

  • Black hole-neutron star collisions may help...
    on April 28, 2021 at 2:19 pm

    Studying the violent collisions of black holes and neutron stars may soon provide a new measurement of the Universe's expansion rate, helping to resolve a long-standing dispute, suggests a new simulation study led by researchers at UCL (University College London).

  • Plasma acceleration: It's all in the mix
    on April 27, 2021 at 2:15 pm

    The LUX team at DESY is celebrating not just one but two milestones in the development of innovative plasma accelerators. The scientists from the University of Hamburg and DESY used their accelerator to test a technique that allows the energy distribution of the electron beams produced to be kept particularly narrow. They also used artificial intelligence to allow the accelerator to optimize its own operation. The scientists are reporting their experiments in two papers published shortly after […]