io4 



Table 42 

 ADDITIONAL PHYSICAL CONSTANTS 



Used or evaluated by Doctor Birge in Phys. Rev. Suppl., I, i, 1929, in 

 connection with Table 40, p. 103. 



Ratio of es to cm units (direct) c' = (2.9979 ± 0.0001 ) X io 10 cm • sec." 1 



Acceleration of gravity (45 ) g*s = 980.616 cm • sec." 8 



Acceleration of gravity (normal) .. .gn = 980.665 cm • sec." 2 

 Mean density of the earth 8 = 5-522 ± 0.002 g • cm" 2 



Maximum density of water. . .5 m (H 2 0) = 0.999973 — 0.000001 g • cm" 3 

 Density of oxygen gas (o°C, Ak) 



L(0 2 ) = 1.428965 ± 0.000030 g • liter" 1 

 Factor converting oxygen (o°C, An,) to 



ideal gas I — a(0 2 ) = 1.000927 ± 0.000030 



Density of nitrogen (o°C, A^) .L(N 2 ) = 1.25046 ± 0.000045 g • liter" 1 

 Factor converting nitrogen (o°C, An) 



to ideal gas 1 — <x(N 2 ) = 1.00043 — 0.00002 



Density of Hg (o°C, An) Dn = 13-59509 ± 0.00003 g ' cm" 3 



International volt ( = pq abs. volts) . .pq = 1.00046 ± 0.00005 

 International joule (= pq' abs. joules) 



pq z = 1. 00041 ± 0.00010 

 Electrochemical equivalent of Ag 



£(Ag) — ( 1.1 1800 ± 0.00005) X io" 3 g • int. coul." 1 

 = ( 1.11805 ± 0.00007) X io" 3 g ■ abs. coul."' 



Density of calcite (20°C) p = 2.7102 ± 0.0004 g ■ cm ~ 3 



Structural constant of calcite (20°C) 



(p(j3) = 1.09630 ± 0.00007 



True grating space of calcite (20°C) 



d'm = (3.0283 ± 0.0010) X io" 8 cm 

 Effective grating space of calcite 



(20 C C) dv> = (3.0279 ± 0.0010) X io" 8 cm 



Rydberg constant for hydrogen Rs = 109677.759 ± 0.05 cm" 1 



Rydberg constant for ionized helium 



R Be = 109722.403 ± 0.05 cm" 1 

 Wave length of red Cd line (i5°C, An) 



\ Cd = 6438.4696 LA. (definition of LA. unit) 

 Rydberg constant for infinite mass. .R<x> = 109737-42 ± 0.06 cm" 1 



cR^ = (3.28988 ± 0.00004) X io 15 sec." 1 



Avogadro's number A^o = Fc/e = (6.064.-.6 ± 0.006) X io 23 mole" 1 



Gas constant per mole. . .Ro = mAn/To= (8.31360 ± 0.0010) X io 7 erg • degree" 1 • mole" 1 

 R' = Ro/(Jk X io 7 ) = 1.98643 ±: 0.0004 cal.js • deg." 1 • mole" 1 



Boltzmann constant k = R e /No = ( 1.37089 ± 0.0014) X io" ie erg • deg." 1 



Second radiation constant (exp. value) 



d = 1.432 ± 0.003 cm • deg. 

 Second radiation constant (indirect) 



d = hc/k = 1.43174 ± 0.0006 cm • deg. 



Radiation density constant. . . .a = 4ff/c= (7.6513 ±0.015) X 10"" erg • cm" 3 deg." 4 



Stefan-Boltzmann constant (exp. value) 



0-= (5.735 ± 0.01 1 ) X io" s erg • cm" 2 • deg." 4 • sec." 1 

 Stefan-Boltzmann constant (indirect) 



o- = 2Tr i k*/lSc 2 h 3 = (5.7139 ± 0.006) X io" 5 erg • cm" 2 • deg." 4 ■ sec." 1 

 Smithsonian Tables 



