physical constants

• acceleration due to gravity

g = 98 dyne g ^-1 = 9.81 m s ^-2

• atomic mass unit

u = 1.6606 10 ^-27 kg

• Avogadro's constant

N _A = 6.022 10 ²³ particles mol ^-1

• Boltzmann's constant

k = 8.617 10 ^-5 eV K ^-1 = 1.38 l0 ^-23 J K ^-1

• Coulomb's constant

k _c = 8.988 10 ⁹ N m ² C ^-2

• electron mass

m _e = 9.1095 10 ^-31 kg

• elementary charge

E = 1.602 10 ^-19 C

• permittivity (free space)

? ₀ = 8.85 10 ^-14 F cm ^-1

• Planck's constant

h = 4.136 10 ^-15 eV s = 6.626 10 ^-34 J s

• speed of light

c = 2.998 10 ¹⁰cm s ^-1

useful combinations

• Coulomb's constant

k _c e ² = 1.44 eV nm

• permittivity (free space)

? ₀ = 55.3 e/V ?m

• permittivity (Si)

? = ? _r ? ₀ = 1.05 10 ^-12 F cm ^-1

• photon energy

E = 1.24 eV at ? = 1 ?m

• thermal energy (300 K)

kT = 0.0258 eV ? 1 eV/40

Prefixes

• k = kilo = 10 ³; M = mega = 10 ⁶; G = giga = 10 ⁹; T =