, Values of Selected Physical Constants
Quantity Symbol SI Units cgs Units
Avogadro’s number NA 6.022 ⫻ 10 23
6.022 ⫻ 1023
molecules/mol molecules/mol
Boltzmann’s constant k 1.38 ⫻ 10⫺23 J/atom # K 1.38 ⫻ 10⫺16 erg/atom # K
8.62 ⫻ 10⫺5 eV/atom # K
Bohr magneton mB 9.27 ⫻ 10⫺24 A # m2 9.27 ⫻ 10⫺21 erg/gaussa
Electron charge e 1.602 ⫻ 10⫺19 C 4.8 ⫻ 10⫺10 statcoulb
Electron mass — 9.11 ⫻ 10⫺31 kg 9.11 ⫻ 10⫺28 g
Gas constant R 8.31 J/mol # K 1.987 cal/mol # K
Permeability of a vacuum m0 1.257 ⫻ 10⫺6 henry/m unitya
Permittivity of a vacuum ⑀0 8.85 ⫻ 10⫺12 farad/m unityb
Planck’s constant h 6.63 ⫻ 10⫺34 J # s 6.63 ⫻ 10⫺27 erg # s
4.13 ⫻ 10⫺15 eV # s
Velocity of light in a vacuum c 3 ⫻ 108 m/s 3 ⫻ 1010 cm/s
a
In cgs-emu units.
b
In cgs-esu units.
Unit Abbreviations
A ⫽ ampere in. ⫽ inch N ⫽ newton
Å ⫽ angstrom J⫽ joule nm ⫽ nanometer
Btu ⫽ British thermal unit K⫽ degrees Kelvin P ⫽ poise
C ⫽ Coulomb kg ⫽ kilogram Pa ⫽ Pascal
⬚C ⫽ degrees Celsius lbf ⫽ pound force s ⫽ second
cal ⫽ calorie (gram) lbm ⫽ pound mass T ⫽ temperature
cm ⫽ centimeter m⫽ meter m ⫽ micrometer
eV ⫽ electron volt Mg ⫽ megagram (micron)
⬚F ⫽ degrees Fahrenheit mm ⫽ millimeter W ⫽ watt
ft ⫽ foot mol ⫽ mole psi ⫽ pounds per square
g ⫽ gram MPa ⫽ megapascal inch
SI Multiple and Submultiple Prefixes
Factor by Which
Multiplied Prefix Symbol
9
10 giga G
106 mega M
103 kilo k
10⫺2 centia c
10⫺3 milli m
10⫺6 micro
10⫺9 nano n
10⫺12 pico p
a
Avoided when possible.
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