814 



SMITHSONIAN PHYSICAL TABLES 



Osmium filament, color temperature, 104 

 Oxides, brightness, 104 



blue brightness, 104 



electrical resistivity, 395 



molten, viscosity, 326 



percentage emissivities, 101 

 Oxygen, abundance, 625 



atomic weight, 47, 619 



boiling point, 117 



combustion constant, 179 



compressibility, 264 



conductivity, thermal, 142 



density, 48 

 critical, 276 



diameter, 644 



dielectric constant, 436 



diffusion, coefficient of, 356 



electric dipole moment, 441 



electrochemical equivalents, 403 



electron configuration, 582, 584, 622 



entropy, 274 



expansion, thermal, 154 



factor to ideal gas, 48 



heat capacity, 163 



index of refraction, 533 



ionization energy for production of ion 

 pair, 711 



isotopes, 655, 658 



magnetic susceptibility, 462 



melting point, 117 



molecular data, 274 



molecular diameter, 644 



molecular velocity, 640 



molecules, number of, 642 



percent in air, 592 



percent in atmosphere, 592 



physical properties, 190 



point, 71 



pressure, critical, 276 



solubility in water, 358 



temperature, critical, 276 



thermal properties (molecular), 274 



Van der Waal's constant, 262 



vapor pressure, 360 



at low temperatures, 360 



velocity of sound in, 306 



Verdet's constant, 506 



viscosity, 331, 642 



volume, relative, 261 



volume conversions, 260 



Packing fraction, 654 

 Palladium point, 72 

 Paramagnetic substances, 451 

 Curie constant, 461 

 temperature, 461 

 Parsec, 63, 731 

 Particles, 



attraction, 652 



range, 652 

 De Broglie wavelength, 653 

 elementary, 651, 664 

 force, attractive, 652 



range, 652 

 fundamental, 664 

 alpha particle, 664 

 characteristics, 664 



Particles — continued 

 deuteron, 664 

 electron, 664 

 negative, 664 

 positive, 664 

 meson, 664 

 neutrino, 664 

 neutron, 664 



production, 664 

 photon, 664 

 positron, 664 

 proton, 664 

 high-energy, devices for producing, 657 

 mass and velocity, 652 

 range, 654 



various, De Broglie wavelength, 665 

 velocity, 665 

 Peltier effect (see also Emf, thermal), 13, 

 379 

 coefficient of, 13 

 iron-constantan, 381 

 metals vs. lead, 380 

 nickel-copper, 381 

 Peltier heats, pressure effects, 382 

 Pendulum, length of seconds, 717 



vs. latitude, 717 

 Pentane candle, 92 

 Perihelion, 731 

 Periodic system, 621 

 Permalloy, 453 

 Permeability, 10, 457 

 iron, 457, 458 

 nickel-iron, 456 

 steel, 458 

 Petroleum (see also Oil) : combustion 

 values, 182 

 compressibility, 284 

 density, 284 

 thermal expansion, 284 

 viscosity, 284 

 p H , 634 



sea water, 777 

 Phot, 93 

 Photoelectric effect, 636 



equation, 636 

 Photoflash lamps, characteristics, 110 

 Photographic materials, 563 



range of, 566 

 Photography, 562 



characteristic curves, 562, 566 

 comparison of nuclear and optical emul- 

 sions, 564 

 definitions, 562 

 developers (formulas), 563 

 edge gradient values, 564 

 formulas for developers, 563 

 illuminants, relative photographic effi- 

 ciency, 565 

 lamps for, 110, 111 

 nuclear track plates, 567 

 emulsions, 567 

 nuclear, 567 

 specification, 567 

 optical emulsions, 564 

 photoflash lamps, 110 

 range of spectral sensitivity, 566 

 resolving power, 564 



