49 



TABLE 26.— GENERAL PHYSICAL CONSTANTS ACCORDING TO BIRGE 



(continued) 



Part 4. — Partial list of derived quantities 



Planck's constant : 



r 7Tr- r 3 F s ~) 1/3 



h = i P J», / ^ r = ( 6 - 624 * ± °- 002 <) x l0 '" er g sec 



IRxNo (c/m) J 

 /i/g = ( „ Iff? 1 * , 1 1/3 = (4.1349 ± 0.0007,) X 10" 7 erg sec abs emu" 1 



h/e' = h/{ec) = ( D f/Cf' A V = (1.3793 3 ± 0.0002 3 ) X 10" 17 erg sec abs esu" 1 

 l/?r.Vo (c/m) J 



Atomic weight of electron : £ = F /(e/m) 



(Physical scale) = (5.4862, ± 0.0017) X 10"* 



(Chemical scale) = (5.4847s ± 0.0017) X 10" 4 



Band spectra constant connecting wave 

 number and moment of inertia : 



'"' (8 " v > = { zas^.wwo } "" = i27ss - * °' 01,) x 10 "" g cm 



Boltzmann constant : 



K = /?„/.V, = VoA u /(ToNo) = (1.38047, ± 0.00026) X lO' 18 erg/deg 



Charge in electrolysis of 1 gram of H 



F/H = 9572.1,3 ± 1.0 abs. emu/g 



Charge in electrolysis of one gram of 

 H l c/M,, 1 = FH' = 9573.5 6 o ± 1.0 abs emu/g 



Compton shift at 90° : 



h/(mc) =\ 2 f F f iC Jff )i y /i = (0.024265,, ± 0.000005,) X 10- 8 cm 



Energy in ergs of one abs volt-electron : 



£ = 10 8 r = IQFF/No = (1.60203, ± 0.00034) X 10" 12 erg 



Energy in calories per mole for one abs volt-electron per molecule : 



£(abs coul/gram-equiv.) ,,„ n . , . , _, 



, , . . — : — -^77 = 23052.65 ± 3.2 calis mole 



Jn(abs joules/cal) 



Fine structure constant : 



a = 2Ac'Y/(hc) = { 4 * R *F( c /' n) \ 1U = (7,2976o ± 0.0008.) X 10" 3 



l/o = 137.030, ±0.016 

 a 2 = (5.3256 ±0.0013) X lO" 5 

 Gas constant per mole: 



/?„ = VoAo/To = (8.31436 ± 0.00038) X 10 7 erg deg- 1 mole" 1 



R'o = R„ X 10- 7 /y,s = 1.98646, ± 0.00021 cal, s deg" 1 mole" 1 



R" = I " c /r = ( 8.20544, ± 0.00037) X 10" 2 1 atm deg" 1 mole" 1 



R"\ = R,/A* = J'o/To = 82.0566, ± 0.0037 cm 3 atm deg" 1 mole" 1 



also : 



R0T0 = J 'oA = (2.27115,, ± 0.00006) X 10 lu erg mole" 1 



Loschmidt number (0°C, A)n.= No/Vo. = (2.6870,, ± 0.0005c, ) X 10'" molecules/cm 3 



Magnetic moment of one Bohr magneton : 



1 ( 2Sc'F>(cfm)n i/» = 92?3<5 ± a(XX)3 x 10 . K erg/paus5 



4?r L RzNo J 



Magnetic moment per mole for one Bohr 

 magneton per molecule: 



kT 1 /27rV£ 5 (r/»0 2 l */» ceo- -> -+■ 1 a -1 „1„-i 



M1.V0 = 7- < ^-rj~ — - > = 358^.2, ± 1.6 erg gauss mole 



4?T t RzNo J 



Mass of a-particle. .Ma = (He — 2£)/.V„ = (6.6442, ± 0.0012) X 10" 24 g 



(continued) 



SMITHSONIAN PHYSICAL TABLES 



