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'•
Useful Constants
=
=
2.997925 X 1010 em/sec
3 X 1010 em/sec
e = 4.8 X 10-10 statcoulomb
Fundamental charge
= 1.6 X 10-19 coulomb
Planck's constant
h = 6.6 X 10-27 erg-sec
h = hj2'1T = 1.0 X 10-27 erg-sec
"Reduced" Planck's constant
me = 0.9 X I0-27 gm
Electron rest mass
mp = 1.7 X 10,.-24 gm
Proton rest mass
G = 6. 7 X w-s CGS units
Gravitational constant
g;::::: 980 cm/sec2
Acceleration of gravity at sea level
ao = 0.5 X w-s em
Bohr radius
No = 6.0 X 1023 mole- 1
Avogadro's number
k = 1.4 X I0-16 erg/deg Kelvin
Boltzmann's constant
Standard temperature
To = 273 deg Kelvin
po :::::; 1 atm = 1.01 X 1(}6 dyne/cm2
Standard pressure
Molar volume at S.T.P.
Vo = 22.4 X 103 cm3/mole
kTo = 3.8 X 10-14 erg ;::::: -}, ev
Thermal energy kT at S.T.P.
Po = 1.3 X 10-3 gm/ cm3
Density of air at S.T.P.
Speed of sound in air at S.T.P.
Vo = 3.32 X 1()4 em/sec
Sound impedance of air at S.T.P.
Zo = 42.8 (dyne/ cm2)/ ('--m/sec)
Io = 1 /LWatt/cm2
Standard sound intensity
Factor of ten in intensity
= 1 bel= 10 db
= 10-I3 em
One fermi (F)
= 1o-s em
One angstrom unit (A)
= I0-4 em
One micron (JL)
One hertz (Hz)
= 1 cycle per second (cps)
Wavelength of one-electron-volt photon
= 1.24 X I0-4 em ;:::::; 12345 A
= 1.6 X 10-12 erg
One electron volt (ev)
One watt (W)
= 1 joule/sec = 107 erg/sec
One coulomb (coul)
= 3 X 1()9 statcoul = c/ 10 statcoul
pne volt (V)
rl-n- statvo)t = 108 / c statvolt
One ohm (n)
= 1/(9 X 1011) statohm = 1()9j c2'St:atohm 0
Thirty ohms
= 1/ c statohm
Impedance per square of vacuum for
electromagnetic waves
= 4'1TI c statohm = 377 ohm
One farad (F)
<:J
==::=:::: • "'
= 9 X 1011 statfarad = c2j 1()9 statfarad 0
One henry (H)
= l/(9 X 1011) stathenry = 1()9jc2 stathenryo
Speed of light in vacuum"
c
0
=
0
0
• In converting from practical units to electrostatic nnits we have approximated the velocity of light as 3.00 X 1()10 em/ sec. Wherever a 3
appears, a more accurate conversion factor can be obtained by using the more accurate value of c. Similarly wherever 9 appears. it is more
accurately t2.998)2.
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