INDEX 



813 



Nickel-iron alloy, temperature effects, 457 

 Nitrogen, abundance, 625, 626, 628 

 atomic weight, 47 

 boiling point, 117 

 compressibility, 264 

 high pressure, 267 

 conductivity, thermal, 142 

 density, 269 



critical, 276 

 dielectric constant, 436 

 diffusion, coefficient of, 356 

 electric dipole moment, 441 

 electron configuration, 582, 584, 622 

 expansion, thermal, 154 

 heat, latent, 166 

 heat capacity, 163 

 index of refraction, 533 

 ionization energy for production of ion 



pair, 711 

 isotopes, 655, 658 

 Joule-Thomson effect, 279 

 magnetic susceptibility, 462 

 melting parameters, 118 

 melting point, 117 



pressure, 119 

 molecular diameter, 643 

 molecular velocity, 640 

 molecules, number of, 638, 642 

 percent in air, 592 

 percent in atmosphere, 592 

 physical properties, 190 

 pressure, critical, 276 

 solubility in water, 358 

 temperature, critical, 276 

 thermal properties (molecular), 272 

 Van der Waal's constant, 262 

 vapor pressure, 360 



at low temperatures, 360 

 relations, 119 

 velocity of sound in, 306 

 Verdet's constant, 506 

 viscosity, 331 

 volume, conversions, 260 

 pressure relation, 119 

 relative, 261 

 Nitroso-dimethyl-anilene, 519 

 Noise (see also Sound), 309 

 Novae (see also under Astronomy), 757 

 Nuclear physics, 651 



artificial disintegration, 651 



produced, 651 

 binding energy, 653 

 cosmic rays, 653 

 definition of terms, 653 

 fields, 651 

 mass-energy, 654 

 mass-velocity, 654 

 particles, 652 

 attraction, 652 

 fundamental, 664 



high-energy, device for producing, 657 

 mass, 654 



formulas, 654 

 velocity and mass, 654 

 radioactivity, 654 

 Nuclear reaction, 665 



barrier penetration, 665 



Nuclear reaction — continued 

 cycles, carbon, 666 

 proton-proton, 666 

 temperature, 666 

 energy produced, 666 

 rates, 666 

 stars, 665 



carbon cycle, 666 

 proton-proton cycle, 666 

 time required, 666 

 Nucleon, 652, 654 

 Nucleus, 654 



mass, 651 

 Nutation, 730 



constant, 730 

 Nylon, 244 



Obliquity of ecliptic, 730 



Observatories, magnetic values (see also 



Geomagnetism), 481 

 Oceans, 772 

 area, 773 



area vs. depth, 773. 774 

 currents, 778 



depth and velocity, 778 

 volume transported, 778 

 depth, greatest mean, 773 

 dissolved, material, 777 

 earthquake waves, velocity, 777 

 geochemistry, 776 

 greatest depth, Atlantic, 773 

 Indian, 773 

 Pacific, 773 

 physical data, 773 

 topography, ocean floor, 773 

 volume, 773 



waves (see Waves at sea) 

 Oersted, 18 

 Ohm, 20 



Oils, index of refraction, 530 

 petroleum, compressibility, 284 



thermal expansion, 284 

 viscosity, 334 

 Optical constants, metals, 558 



crystals (see also Crystals), 509, 513 

 glass (see also Glass), 509-514 

 pyrometry, 97 



brightness temperature, 7, 97 



correction to true, 99 

 calibration of pyrometer, 97 

 effective wavelengths, 97 

 emissivity, 98 

 monochromatic screen, 97 



effective wavelengths, 97 

 true temperature, 97, 99 

 wavelength used, 97, 537 

 Orbits, planets, 734 

 Orchestral instruments, frequency range, 



311 

 Organic compounds, boiling point, 122 

 density, 122 



liquids, dielectric constant, 424, 439 

 spreading coefficients, 633 

 vapor pressure, 368 

 melting point, 122 

 solubility vs. temperature, 358 



