Physical Constant

Cosma / Communication / Knowledge / Realm / Physical / Law / Constant
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Introduction1

Encyclopedia

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, 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

Physical Constant (Encyclopædia Britannica)

Fundamental Physical Constants (NIST)
CODATA Internationally Recommended Values of Fundamental Physical Constants (NIST)
CODATA Internationally Recommended Values of Fundamental Physical Constants, Universal (NIST)

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

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Innovation

Science

There’s a Glitch At The Edge of The Universe That Could Remake Physics (Michael Brooks, New Scientist)
Humankind’s Existentially Lucky Numbers (George Johnson, New York Times)
A Brief History of the Grand Unified Theory of Physics (Lawrence M. Krauss, Nautilus)

Echelle SPectrograph for Rocky Exoplanet and Stable Spectroscopic Observations (ESPRESSO, European Southern Observatory)
ESPRESSO (Wikipedia)

Fine-structure Constant (NIST)
Fine-structure Constant (Wikipedia)

Commerce

Product

Physical Constant Gifts (Zazzle)

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Preservation

History

Subatomic Stories (Fermilab, YouTube Channel)

Planck Length, Minimal Length? (Don Lincoln, Fermilab Today)
Possible Connection Between Gravitation and Fundamental Length (Alden Mead, Physical Review)
On Absolute Units, III: Absolutely Not? (Frank Wilczek, Physics Today)

Max Planck (Encyclopædia Britannica)
Planck’s constant (Encyclopædia Britannica)

Fundamental Physical Constants: Introduction to the Constants for Nonexperts (NIST)

Library

Library of Congress # QC Physics (UPenn Online Books)

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

Education

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources

Community

Occupation

Physicists (CareerOneStop, U.S. Department of Labor, Employment and Training Administration)
Careers in Physical Sciences (Physics World)

Organization

American Physical Society (APS)
European Physical Society (EPS)
American Institute of Physics (AIP)

News

Physical Constants (Phys.org)

Government

Document

Physical Constants (USA.gov)

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Related

Here are links to pages about closely related subjects.

Knowledge Realm

Physical

“Fundamentals”
Law (Constant) Relativity
Force Gravity, Electromagnetism (Light, Color)
Matter (Microscope) Molecule, Atom (Periodic Table), Particle

“Space”
Universe (Astronomical Instrument)
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Our Neighborhood
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid

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Notes

1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.