Processing math: 5%

Physical constants

Name Symbol Value Unit
Number $\pi$ $\pi$ $3.14159265358979323846...$
Number e e $2.71828182845904523536...$
Euler's constant $\gamma$ $\gamma=\lim\limits_{n\rightarrow\infty}\left(\sum\limits_{k=1}^n 1/k-\ln(n)\right)=0.5772156649...$

Elementary charge $e$ $1.602176634\cdot10^{-19}$ C
Gravitational constant $G, \kappa$ $6.67430(15)\cdot10^{-11}$ $\rm m^3 kg^{-1} s^{-2}$
Fine-structure constant $\alpha=e^2/2hc\varepsilon_0$ $\approx1/137$
Speed of light in vacuum $c$ $2.99792458\cdot10^8$ m/s (def)
Permittivity of the vacuum $\varepsilon_0$ $8.8541878128(13)\cdot10^{-12}$ F/m
Permeability of the vacuum $\mu_0$ $4\pi\cdot10^{-7}$ H/m
$(4\pi\varepsilon_0)^{-1}$ $8.9876\cdot10^9$ $\rm Nm^2 C^{-2}$

Planck's constant $h$ $6.62607015\cdot10^{-34}$ Js
Dirac's constant $\hbar=h/2\pi$ $1.054571817\cdot10^{-34}$ Js
Bohr magneton $\mu_{\rm B}=e\hbar/2m_{\rm e}$ $9.2740100783(28)\cdot10^{-24}$ Am $^2$
Bohr radius $a_0$ $0.529177210903(80)$ Å
Rydberg's constant $Ry$ 13.605693122994(26) eV
Electron Compton wavelength $\lambda_{\rm Ce}=h/m_{\rm e}c$ $2.42631023867(73)\cdot10^{-12}$ m
Proton Compton wavelength $\lambda_{\rm Cp}=h/m_{\rm p}c$ $1.32140985539(40)\cdot10^{-15}$ m
Reduced mass of the H-atom $\mu_{\rm H}$ $9.1045755\cdot10^{-31}$ kg

Stefan-Boltzmann's constant $\sigma$ $5.670374419\cdot10^{-8}$ Wm $^{-2}$ K $^{-4}$
Wien's constant $k_{\rm W}$ $2.897771955...\cdot10^{-3}$ mK

Molar gasconstant $R$ $8.31446261815324$ J $\cdot$ mol $^{-1}\cdot$ K $^{-1}$
Avogadro's constant $N_{\rm A}$ $6.02214076\cdot10^{23}$ mol $^{-1}$
Boltzmann's constant $k=R/N_{\rm A}$ $1.380649\cdot10^{-23}$ J/K

Electron mass $m_{\rm e}$ $9.1093837015(28)\cdot10^{-31}$ kg
Proton mass $m_{\rm p}$ $1.67262192369(51)\cdot10^{-27}$ kg
Neutron mass $m_{\rm n}$ $1.67492749804(95)\cdot10^{-27}$ kg
Elementary mass unit $m_{\rm u}=\frac{1}{12}m(^{12}_{~6})$ C $1.66053906660(50)\cdot10^{-27}$ kg
Nuclear magneton $\mu_{\rm N}$ $5.050783699(31)\cdot10^{-27}$ J/T

Diameter of the Sun $D_\odot$ $1392\cdot10^6$ m
Mass of the Sun $M_\odot$ $1.989\cdot10^{30}$ kg
Rotational period of the Sun $T_\odot$ $25.38$ days
Radius of Earth $R_{\rm A}$ $6.378\cdot10^6$ m
Mass of Earth $M_{\rm A}$ $5.976\cdot10^{24}$ kg
Rotational period of Earth $T_{\rm A}$ $23.96$ hours
Earth orbital period Tropical year $365.24219879$ days
Astronomical unit AU $1.4959787066\cdot10^{11}$ m
Light year lj $9.4605\cdot10^{15}$ m
Parsec pc $3.0857\cdot10^{16}$ m
Hubble constant $H$ $\approx(75\pm25)$ km $\cdot$ s $^{-1}\cdot$ Mpc $^{-1}$

Name	Symbol	Value	Unit
Number $\pi$	$\pi$	$3.14159265358979323846...$
Number e	e	$2.71828182845904523536...$
Euler's constant	$\gamma$	$\gamma=\lim\limits_{n\rightarrow\infty}\left(\sum\limits_{k=1}^n 1/k-\ln(n)\right)=0.5772156649...$

Elementary charge	$e$	$1.602176634\cdot10^{-19}$	C
Gravitational constant	$G, \kappa$	$6.67430(15)\cdot10^{-11}$	$\rm m^3 kg^{-1} s^{-2}$
Fine-structure constant	$\alpha=e^2/2hc\varepsilon_0$	$\approx1/137$
Speed of light in vacuum	$c$	$2.99792458\cdot10^8$	m/s (def)
Permittivity of the vacuum	$\varepsilon_0$	$8.8541878128(13)\cdot10^{-12}$	F/m
Permeability of the vacuum	$\mu_0$	$4\pi\cdot10^{-7}$	H/m
$(4\pi\varepsilon_0)^{-1}$		$8.9876\cdot10^9$	$\rm Nm^2 C^{-2}$

Planck's constant	$h$	$6.62607015\cdot10^{-34}$	Js
Dirac's constant	$\hbar=h/2\pi$	$1.054571817\cdot10^{-34}$	Js
Bohr magneton	$\mu_{\rm B}=e\hbar/2m_{\rm e}$	$9.2740100783(28)\cdot10^{-24}$	Am $^2$
Bohr radius	$a_0$	$0.529177210903(80)$	Å
Rydberg's constant	$Ry$	13.605693122994(26)	eV
Electron Compton wavelength	$\lambda_{\rm Ce}=h/m_{\rm e}c$	$2.42631023867(73)\cdot10^{-12}$	m
Proton Compton wavelength	$\lambda_{\rm Cp}=h/m_{\rm p}c$	$1.32140985539(40)\cdot10^{-15}$	m
Reduced mass of the H-atom	$\mu_{\rm H}$	$9.1045755\cdot10^{-31}$	kg

Stefan-Boltzmann's constant	$\sigma$	$5.670374419\cdot10^{-8}$	Wm $^{-2}$ K $^{-4}$
Wien's constant	$k_{\rm W}$	$2.897771955...\cdot10^{-3}$	mK

Molar gasconstant	$R$	$8.31446261815324$	J $\cdot$ mol $^{-1}\cdot$ K $^{-1}$
Avogadro's constant	$N_{\rm A}$	$6.02214076\cdot10^{23}$	mol $^{-1}$
Boltzmann's constant	$k=R/N_{\rm A}$	$1.380649\cdot10^{-23}$	J/K

Electron mass	$m_{\rm e}$	$9.1093837015(28)\cdot10^{-31}$	kg
Proton mass	$m_{\rm p}$	$1.67262192369(51)\cdot10^{-27}$	kg
Neutron mass	$m_{\rm n}$	$1.67492749804(95)\cdot10^{-27}$	kg
Elementary mass unit	$m_{\rm u}=\frac{1}{12}m(^{12}_{~6})$ C	$1.66053906660(50)\cdot10^{-27}$	kg
Nuclear magneton	$\mu_{\rm N}$	$5.050783699(31)\cdot10^{-27}$	J/T

Diameter of the Sun	$D_\odot$	$1392\cdot10^6$	m
Mass of the Sun	$M_\odot$	$1.989\cdot10^{30}$	kg
Rotational period of the Sun	$T_\odot$	$25.38$	days
Radius of Earth	$R_{\rm A}$	$6.378\cdot10^6$	m
Mass of Earth	$M_{\rm A}$	$5.976\cdot10^{24}$	kg
Rotational period of Earth	$T_{\rm A}$	$23.96$	hours
Earth orbital period	Tropical year	$365.24219879$	days
Astronomical unit	AU	$1.4959787066\cdot10^{11}$	m
Light year	lj	$9.4605\cdot10^{15}$	m
Parsec	pc	$3.0857\cdot10^{16}$	m
Hubble constant	$H$	$\approx(75\pm25)$	km $\cdot$ s $^{-1}\cdot$ Mpc $^{-1}$