# Fundamental Physical Constants

Name and Symbol Value
atomic mass unit (amu)
$1.6605402 \times {10}^{-27}\text{kg}$
$6.0221367 \times {10}^{23}{\text{mol}}^{-1}$
Boltzmann’s constant (k)
$1.380658 \times {10}^{-23}\text{J}{\text{K}}^{-1}$
charge-to-mass ratio for electron (e/me)
$1.75881962 \times {10}^{11}\text{C}{\text{kg}}^{-1}$
electron charge (e)
$1.60217733 \times {10}^{-19}\text{C}$
electron rest mass (me)
$9.1093897 \times {10}^{-31}\text{kg}$
$9.6485309 \times {10}^{4}{\text{C mol}}^{-1}$
gas constant (R)
$8.205784 \times {10}^{-2}\text{L atm mol}^{-1}{\text{K}}^{-1}=8.314510\text{J}{\text{mol}}^{-1}{\text{K}}^{-1}$
molar volume of an ideal gas, 1 atm, 0 °C 22.41409 L mol–1
molar volume of an ideal gas, 1 bar, 0 °C 22.71108 L mol–1
neutron rest mass (mn)
$1.6749274 \times {10}^{-27}\text{kg}$
Planck’s constant (h)
$6.6260755 \times {10}^{-34}\text{J}\text{s}$
proton rest mass (mp)
$1.6726231 \times {10}^{-27}\text{kg}$
Rydberg constant (R)
$1.0973731534 \times {10}^{7}{\text{m}}^{-1}=2.1798736 \times {10}^{-18}\text{J}$
speed of light (in vacuum) (c)
$2.99792458 \times {10}^{8}\text{m}{\text{s}}^{-1}$