48 



TABLE 26.— GENERAL PHYSICAL CONSTANTS ACCORDING TO BIRGE 



(continued) 



Part 3. — Additional quantities evaluated or used in connection with Part 1 



Ratio of esu to emu (direct) c' = (2.9971, ± 0.0001) X 10 10 cm 1 / 8 sec- 1 / 2 ohm 1 / 2 



= (2.9978< ± O.OOOlo) X 10 10 cm/sec 



Ratio of esu to emu (indirect) c' = c= (2.99776 ± 0.0004) X 10 10 cm/ser 



Average density of earth 5 = 5.517 ± 0.004 g/cm 3 



Maximum density of water 5 m (H,0) = 0.999972 ± 0.000002 g/cm 8 



Acceleration of gravity (standard) go = 980.665 cm/sec 2 



Acceleration of gravity (45°) g*s = 980.616 cm/sec 2 



Density of oxygen gas (0°C, A») U = 1.42897 ± 0.0003 g/liter 



Limiting density of oxygen gas (0°C, An) 



Lum = 1.427609 ± 0.000037 g/liter 

 Factor converting oxygen (0°C, A ti ) 



to ideal gas 1 — a = 1.000953, ± 0.000009, 



Specific gravity of Hg (0°C, A ) re- 

 ferred to air-free water at maximum 



density P« = 13.59542 ± 0.00005 



Density of Hg (0°C, A ) Do = 13.59504* ± 0.00005: g/cm 8 



Electrochemical equivalents (chemical 

 scale) : 



Silver (apparent) £a 6 = (1.11800 ±0.00012) X 10" 8 g/int coul 



(corrected) Ea, = (1.11807 ± 0.00012) X 10" 8 g/abs coul 



Iodine (apparent) Ex = (1.315026 ±0.000025) X 10" 8 g/int coul 



(corrected) ...£i = ( 1.31535 ± 0.00014) X 10' 8 g/abs coul 



Effective calcite grating space (18°C) 



Siegbahn system d"„ = 3.02904 X 10" 8 cm 



True calcite grating space (20°C) . . . .d\o — 3.02951, X 10" 8 cm 



Siegbahn system 

 True calcite grating space (20°C) . . . .d» = (3.03567, ± 0.00018) X I0" 8 cm 



cgs system 

 Ratio of grating and Siegbahn scales of 



wavelengths X,/X. = 1.002034 ± 0.000060 



Density of calcite (20°C) p — 2.71029 ± 0.00003 g/cm 8 



Structural constant of calcite (20°C) . . .* = 1.09594 ± 0.00001 

 Molecular weight of calcite (chemical 



scale) M = 100.09L ± 0.005 



Rydberg constant for hydrogen (H 1 ). .R„ = 109677.581, ± 0.007 5 cm" 1 (I. A. scale) 

 Rydberg constant for deuterium (H 2 ) ..R D = 109707.419 3 ± 0.0075 cm- 1 (LA. scale) 



Rydberg constant for helium R,u = 109722.263 ± 0.012 cm" 1 (LA. scale) 



Rydberg constant for infinite mass R x — 109737.303 ± 0.017 cm" 1 (LA. scale) 



or ±0.05 cm" 1 (cgs system) 



{continued) 



SMITHSONIAN PHYSICAL TABLES 



