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Physical constant - Wikipedia
A physical constant, sometimes fundamental physical constant or universal constant, is a physical quantity that cannot be explained by a theory and therefore must be measured experimentally. It is distinct from a mathematical constant, which has a fixed numerical value, but does not directly involve any physical … See more
Physical constants are parameters in a physical theory that cannot be explained by that theory. This may be due to the apparent fundamental nature of the constant or due to … See more
Numerical values
Whereas the physical quantity indicated by a physical constant does not depend on the unit system used … See moreBy definition, fundamental physical constants are subject to measurement, so that their being constant (independent on both the time and … See more
Some physicists have explored the notion that if the dimensionless physical constants had sufficiently different values, our Universe would be so radically different that intelligent life … See more
May 2019all of the units in the International System of Units have been redefined in terms of fixed natural phenomena, including three fundamental constants: the speed of light in vacuum, c; the Planck constant, h; and the elementary charge, e.1983the speed of light was given a defined value in SI units.1940sit became clear that the value of the fine-structure constant deviates significantly from the precise value of 1/137, refuting Eddington's argument.1937Paul Dirac speculated that physical constants such as the gravitational constant or the fine-structure constant might be subject to change over time in proportion of the age of the universe.1929Arthur Eddington constructed an argument why the value of the fine-structure constant might be 1/137 precisely, which related to the Eddington number, his estimate of the number of protons in the Universe.The number of fundamental physical constants depends on the physical theory accepted as "fundamental". Currently, this is the theory of general relativity for gravitation and the See more
Any ratio between physical constants of the same dimensions results in a dimensionless physical constant, for example, the proton-to-electron mass ratio. The See more
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