Units Currencies
Constants
Units Home
Unit Conversion
List Units
List Categories
Currencies
SI System
Base Units
Derived Units
Prefixes
Numbers
Constants
Base-N
Fractions
Time/Decimal
Resources
Bibliography
World Pumps

Major news, innovation and real-life applications for pumps and ancillary equipment.

Reinforced Plastics

Informed and impartial coverage on the global composites industry.

Machine Design

How-to, in-depth technical articles for machine design engineers

Quality Magazine

Techniques to improve quality on the shop floor and in manufacturing planning.

more free magazines
 

Name Symbol Value
atomic mass constant mu 1.660539x10-27 kg
Avogadro constant NA 6.022142x1023 /mol
Bohr magneton mB 9.274009x10-24 J/T
Bohr radius a0 5.291772x10-11 m
Boltzmann constant k 1.380650x10-23 J/K
conductance quantum G0 7.748092x10-5 S
electric permittivity constant e0 1/(m0·c2) = 8.85418781...x10-12 F/m
electron Compton wavelength lc 2.426310x10-12 m
electron magnetic moment me 9.284764x10-24
electron radius (classical) re 2.817940x10-15 m
electron rest mass me 9.109382x10-31 kg
electron volt eV 1.602176x10-19 J
elementary charge e 1.602176x10-19 C
Euler's constant g 0.577215664901532...
Faraday constant F 9.648524x104 C/mol
fine-structure constant a 7.297353x10-3
first radiation constant c1 3.741771x10-16 W/m2
golden ratio f 1.618033988749894...
gravitational constant G 6.6732x10-11 N-m2/kg2
Josephson constant KJ 4.835979x1014 Hz/V
magnetic flux quantum F0 2.067834x10-15 Wb
magnetic permeability constant m0 4p x10-7 = 1.2566370614...x10-6 H/m
natural log base e 2.718281828459045...
neutron magnetic moment mn 9.662364x10-27 J/T
neutron rest mass mn 1.674927x10-27 kg
nuclear magneton mN 5.050783x10-27 J/T
pi p 3.14159265358979323846264...
Planck constant h 6.626069x10-34 J-s
proton Compton wavelength lc,p 1.321410x10-15 m
proton magnetic moment mp 1.410607x10-26 J/T
proton rest mass mp 1.672622x10-27 kg
Rydberg constant 1.097373x107 /m
second radiation constant c2 1.438775x10-2 m-K
speed of light in vacuum c 2.99792458x108 m/s
standard volume of ideal gas V0 2.24136x10-2 m3/mol
Stefan-Boltzmann constant s 5.670400x10-8 W/m2-K4
universal gas constant R 8.314472 J/mol-K
Wien displacement law constant b 2.897769x10-3 m-K
Glossary