Physical Constant

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


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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.

  • Gravitational waves will settle cosmic conundrum
    on February 14, 2019 at 4:00 pm

    Measurements of gravitational waves from approximately 50 binary neutron stars over the next decade will definitively resolve an intense debate about how quickly our universe is expanding, according to findings from an international team that includes University College London (UCL) and Flatiron Institute cosmologists. […]

  • Preventing animal cruelty is physically and...
    on February 14, 2019 at 1:18 pm

    The content you're about to read is not graphic. But it is troubling, because the realities of animal cruelty are troubling. This article is not intended to make you recoil, but rather to encourage you to understand and care. […]

  • Mathematical monotsukuri: Summing a constant may...
    on February 14, 2019 at 12:21 pm

    Scientists at Tokyo Institute of Technology found a simple, yet effective way to improve how synchronization is measured in chaotic systems. The technique consists of adding a constant parameter to the "analytic signals" in a way that emphasizes certain aspects of their timing. This could improve brain-computer interfaces designed to aid disabled people. […]

  • 3-D experiments shed new light on shape memory...
    on February 14, 2019 at 8:03 am

    Shape memory alloys are well known for their remarkable properties—superelasticity, shape memory and actuation allow them to be crumpled up and then spring back to a "remembered" original shape. […]

  • Running an LED in reverse could cool future...
    on February 13, 2019 at 8:22 pm

    In a finding that runs counter to a common assumption in physics, researchers at the University of Michigan ran a light emitting diode (LED) with electrodes reversed in order to cool another device mere nanometers away. […]