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The constants listed here are known values of physical constants expressed in SI units; that is, physical quantities that are generally believed to be universal in nature and thus are independent of the unit system in which they are measured. Many of these are redundant, in the sense that they obey a known relationship with other physical ...
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 measurement.
also called torsion constant newton meter per radian (N⋅m/rad) lambda: cosmological constant: per second squared (s −2) wavelength: meter (m) linear charge density: coulomb per meter (C/m) eigenvalue: non-zero vector: mu: magnetic moment: ampere square meter (A⋅m 2)
The term fundamental physical constant is sometimes used to refer to some universal dimensionless constants. Perhaps the best-known example is the fine-structure constant , α , which has an approximate value of 1 / 137.036 .
The tables also include pure numbers, dimensionless ratios, or dimensionless physical constants; these topics are discussed in the article. Biology and medicine
A mathematical constant is a key number whose value is fixed by an unambiguous definition, ... List of physical constants; Particular values of the Riemann zeta function;
Physical constant * List of physical constants; List of scientific constants named after people; A. Alpha particle mass; Astronomical constant; Avogadro constant; B ...
In particle physics and physical cosmology, Planck units are a system of units of measurement defined exclusively in terms of four universal physical constants: c, G, ħ, and k B (described further below). Expressing one of these physical constants in terms of Planck units yields a numerical value of 1.