792 



SMITHSONIAN PHYSICAL TABLES 



Atom — continued 



elementary particles, 618, 664 

 energy, 579, 653 

 heat, elements, 160 

 ionized, 584 



singly, 584 

 isotopes, 654 

 mass, 50, 51 

 mass units, 654 

 molecular data, 618 

 names, 620 



foreign, 620 



obsolete, 620 

 neutral, electron binding energy, 649, 650 



spectroscopic properties, 582 

 number, 620 

 periodic system, 621 

 radii, 643 



effective, 643 

 radioactive, 672, 673 

 specific heats, 160 



spectra (see also Series relations), 582 

 spectroscopic properties, 582-585 



neutral, 582 



singly ionized, 584 

 susceptibility, 451 

 volume (elements), 160 



inert gas, 646 

 weights, 47, 619 



international, 619 



physical to chemical, 47 



units, 47 

 Atomic (see Atom), 653 

 Attenuation coefficient, radio waves, 442, 



443 

 Avogadro's number, 4, 47, 51, 54 

 Avoirdupois, 62, 63, 64, 66 



Babbitt metal, physical properties, 226 

 Bakelite, 152 

 Bar, 4, 277 

 Barn, 653 

 Barometer, 606 



capillarity, correction for, 606 



metric units, 606 

 determination of heights, 613 

 expansion, correction for, 607 

 mercury meniscus, volume, 606 

 pressure: columns of mercury, 606 



columns of water, 606 

 reduction: barometric height to standard 

 temperature, 607 

 to standard gravity (different heights), 

 608 

 English units, 611 

 metric units, 609 

 temperature correction, 607 

 Barye, 4, 277 



mega, 6 

 Baryton, 653, 664 

 Batteries, 377 

 composition, 377 

 emf, 377 



standard cells, 378 

 Baume scale: density of cane sugar, 305 

 specific gravity of, 289 



Bel, 309 



Beta particles, 651, 653, 691 

 Beta rays (see also Radioactivity), 653 

 characteristics, 651, 672, 683, 691 

 from radioactive materials, 683, 685 

 energy, 683, 684 

 isotopes, 683, 684 

 spectrum: actinium 228, 685 

 protactinium, 685 

 thallium, 679 

 thorium 227, 685 

 Betatron, 653, 657 



Binding energy of electron, neutral atoms, 

 649, 652, 653 

 singly-ionized atoms, 650 

 Blackbody, 7, 79, 80 

 brightness, 95, 96 



calculated values, 81, 82, 85, 95, 104 

 changes due to changes in C2, 86 

 precautions in using ci, 80 

 constants (radiation) , 80 



value of C2 at different times, 80 

 crova wavelength, 96 

 efficiency of radiation, 96 



luminous, 93 

 equations, 7, 79 

 Planck, 7, 79 

 Stefan-Boltzmann, 7, 80 

 Wien, 79 



displacement, 80 

 laws, 7, 79 

 lumens/cm, 93, 96 

 lumens/watt, 93, 96 

 luminous efficiency, 93 



temperature, 96 

 luminous intensity, 93 



spectral vs. temperature, 95 

 mechanical equivalent of light, 96 

 plane, lumens per unit, 80 



solid angle, 80 

 radiant energy, 79 



calculated values: effect of change in 

 C2, 86 

 short method, 85 

 spectral, 82 

 temperature, 82 

 spectral intensity vs. temperature, 95 

 spectral luminous intensity, 95 

 standard radiator, 79 

 symbols, 79 

 total radiation, 81 

 calculated values, 81 

 Blackening receivers of radiation, 548 

 Body moving through a liquid (see also 



under Aeronautics), 337 

 Bohr atom, 581 



magnetic moment, 49 

 magnetron, 49, 52, 54 

 radius first orbit, 51 

 Boiling points: elements, 117 

 inorganic compounds, 120 

 metals with pressure, 119 

 organic compounds, 122 

 pressure, 119 

 salts in solution, 131 

 rise in, 133 



