Constant

Symbol Quantity Value
D Debye 2.53 × 10−18 esu cm
G Gravitational constant 6.67 × 10 −8 dyne cm2 g−1
NA Avogadro’s number 6.022 × 1023 mole−1
a0 Bohr radius 5.29 × 10−9 cm
c Velocity of light 2.99792 × 10 10 cm s−1
e Charge of the electron 4.80325 × 10 −10 electrostatic units (esu)
eV One electron volt 1.602 × 10−12 erg
h Planck’s constant 6.626 × 10−27 erg s
k Boltzmann’s constant 1.380 × 10−16 erg degree−1
me Mass of the electron 9.11 × 10 −28 g
mp Mass of the proton 1.672 × 10−24 g
σ Stefan–Boltzmann constant 1.80 × 10 −5 erg cm−2 degree−4 s−1

Multipliers