Description Symbol Value Units
Acceleration due to gravity $\mathrm{g}$ $9.80665 $ $\mathrm{m/s^2}$
Standard atmosphere $\mathrm{atm}$ $101325 $ $\mathrm{N/m^2}$
Thermochemical kilocalorie $\mathrm{kcal}$ $4184$ $\mathrm{J}$
Speed of light in vacuum $\mathrm{c}$ $2.997925 \times 10^8$ $\mathrm{m/s}$
Electronic charge $\mathrm{e}$ $1.6022 \times 10^{-19}$ $\mathrm{C}$
Electron charge/mass $\mathrm{e / m_e}$ $1.76 \times 10^{11}$ $\mathrm{C/kg}$
Permeability of free space $\mu_\mathrm{o}$ $1.26 \times 10^{-6}$ $\mathrm{H/m}$
Permittivity of free space $\epsilon_\mathrm{o}$ $8.8542 \times 10^{-12} $ $\mathrm{C^2N^{-1}m^{-2}}$
Avogadro constant $\mathrm{N_A}$ $6.0225 \times 10^{26}$ $\mathrm{kmol^{-1}}$
Faraday constant $\mathrm{F}$ $9.6487 \times 10^7 $ $\mathrm{C/kmol}$
Rydberg constant $\mathrm{R}$ $1.0974 \times 10^7 $ $\mathrm{m^{-1}}$
Planck constant $\mathrm{h}$ $6.6262 \times 10^{-34} $ $\mathrm{Js}$
$4.1356 \times 10^{-15}$ $\mathrm{eV s}$
Bohr magneton ($\mathrm{eh}/4\pi \mathrm{m}_e$) $\mu_\mathrm{B}$ $9.2732 \times 10^{-24}$ $\mathrm{Am^2}$
Nuclear magneton ($\mathrm{e}\mathrm{h}/4\pi \mathrm{m}_p$) $\mu_\mathrm{N}$ $5.0505 \times 10^{-27}$ $\mathrm{Am^2}$
Universal gas constant $\mathrm{R}$ $8314$ $\mathrm{JK/kmol}$
$1.987 $ $\mathrm{kcal\;K/kmol}$
Ideal gas normal volume (STP) $22.414$ $\mathrm{m^3/kmol}$
Boltzmann constant $\mathrm{k}$ $1.3805 \times 10^{-23} $ $\mathrm{J/K}$
Wien displacement constant $\mathrm{A}$ $2.8978 \times 10^{-3}$ $\mathrm{mK}$
Stefan-Boltzmann constant $\sigma$ $5.670 \times 10^{-8}$ $\mathrm{Wm^2/K^4}$
Gravitational constant $\mathrm{G}$ $6.67 \times 10^{-11}$ $\mathrm{N m^2/kg^2}$
Atomic mass unit $\mathrm{amu}$ $1.6604 \times 10^{-27}$ $\mathrm{kg}$
Rest energy of 1 amu $931.48$ $\mathrm{MeV}$
Electron volt $\mathrm{eV}$ $1.60210 \times 10^{-19}$ $\mathrm{J}$
Rest mass of electron $\mathrm{m_e}$ $5.48597 \times 10^{-4}$ $\mathrm{amu}$
$9.1095 \times 10^{-31}$ $\mathrm{kg}$
0.511006 $\mathrm{MeV}$
Rest mass of proton $\mathrm{m_p}$ 1.0072766 $\mathrm{amu}$
$ 1.6726 \times 10^{-27}$ $\mathrm{kg}$
$938.26$ $\mathrm{MeV}$