806 



SMITHSONIAN PHYSICAL TABLES 



Hydrogen — continued 

 compressibility, 264 



factor, 264 



high pressure, 267 



low temperature, 264 

 cycle. 666 



De Broglie wavelength, 665 

 density, 276, 291 



critical, 276 

 dielectric constant, 423 

 doublet separation, 55 

 electric dipole moment, 441 

 electron configuration, 582, 584 

 heat, latent, 166 

 heat capacity, 163 

 heavy, 54, 653, 655 

 index of refraction, 533 

 ions, diffusion coefficient, 644 



ionization energy necessary for produc- 

 tion of ion pair, 711 



ionizing potential, 53 



mobility, 644 

 isotopes, 655 



deuteron, 653 



triton, 654 

 long-wave absorption, 552 

 magnetic susceptibility, 462 

 mass, 50 



relative to mass of proton, 50 

 mass absorption coefficient, 704 

 melting point, 117 

 molecular, properties of, 268 

 molecules, diameter, 642, 643 



mass, 640 



mean free path, 642 



number of, 645 



rate of incidence, 640 



velocity, 640 

 percent in air, 592 

 physical properties, 189 

 pressure, critical, 276 

 radii of electronic orbit, 624 

 Rydberg constant, 48, 54 

 Schrodinger constant, 51, 54 

 temperature, critical, 276 

 thermal conductivity, 142 

 thermal properties, 268 

 thermal resistivity, 144 

 Van der Waal's constant, 261, 262 

 velocity of sound in, 306 

 viscosity, 642 

 volume, relative, 261, 264 



with pressure, 267 

 Hydrolysis, ammonium acetate, 399 

 Hysteresis, 451 



losses, Steinmetz constant, 460 



Ice crystals, modifications of, 119 

 Ice point, 47, 71 



effect of pressure, 119 

 Iceland spar, 521, 545 

 I.C.I, standard observer, 90 



distribution coefficients, 91 

 Ignition temperature: dusts in air, 634 



gas mixtures, 186 

 Illuminants (see also Lamps) : brightness, 

 104 



brightness temperature, 104 



Illuminants — continued 

 color temperature, 104 

 photographic efficiency, 565 

 Illumination, 93 

 expressions, 93 

 on surface, 93 

 symbols, 94 

 units, relative magnitudes, 91 



conversion factors, 91, 94 

 Impulse generator, 657 

 Incandescent filaments, heat losses, 116 

 Incandescent lamps (see also Lamps) : effi- 

 ciency of, 1878 to date, 105 

 efficiency of tungsten, 106 

 minature, 107 

 photoflash, 110 

 sealed-beam, 108 

 temperature of tungsten, 106 

 Inclination: magnetic (see also under Geo- 

 magnetism) , 471 

 moon's orbit, 735 

 Index of refraction: air, 532 

 alums, 521 

 crystals, 515, 529 



artificial, 515 

 fats, 525, 530 

 fluorite, 520 



calcium, 520 



lithium, 521 

 gases, 533 



liquefied, 525 

 glasses: change with temperature, 513, 

 520 



foreign-made, 513 



nonsilica, 512 

 Iceland spar, 521, 545 

 isotropic materials, 522 



monorefringent. 522 

 liquefied gases, 525 

 liquids, 530 



relative to air, 530 

 lithium fluoride, 521 

 media for determination with microscope, 



561 

 minerals, biaxial, 526 



monorefringent, 522 



uniaxial, 524 

 nitroso-dimethyl-aniline, 519 

 oils, 525 

 plastics, 240 

 potassium bromide, 519 

 potassium chloride, 519 



formula, 519 

 potassium iodide, 516 

 quartz, 518 

 reflection vs. 549 

 rock salt, 518 



formulas, 518 

 silver chloride, 520 

 silvite, 519 

 solutions, acids, relative to air, 531 



salts, relative to air, 531 

 thallium bromide-iodide, 516 

 vapors, 533 

 waxes, 525 

 Inductance (electrical), 17 

 mutual, 13 



