624
Appendix A: International Units and Physical Constants
(continued)
Constant
Symbol
Value (mks units)
Planck’s constant
h
6.6256 × 10 −34 J·s
Boltzmann’s constant
k B
1.38054 × 10 −23 J/K
k B T/q at T = 300 K
–
0.02586 eV
Permittivity of free space
ε 0
8.8542 × 10 −12 F/m
Permeability of free space
μ 0
4π × 10 −7 N/A 2
Electron volt
eV
1 eV = 1.60218 × 10 −19 J
Angstrom unit
Å
1 Å = 10 −4 μm = 10 −8 cm
Base of natural logarithm
e
2.71828
Pi
π
3.14159
Appendix A: International Units and Physical Constants
(continued)
Constant
Symbol
Value (mks units)
Planck’s constant
h
6.6256 × 10 −34 J·s
Boltzmann’s constant
k B
1.38054 × 10 −23 J/K
k B T/q at T = 300 K
–
0.02586 eV
Permittivity of free space
ε 0
8.8542 × 10 −12 F/m
Permeability of free space
μ 0
4π × 10 −7 N/A 2
Electron volt
eV
1 eV = 1.60218 × 10 −19 J
Angstrom unit
Å
1 Å = 10 −4 μm = 10 −8 cm
Base of natural logarithm
e
2.71828
Pi
π
3.14159