INDEX 



797 



Decibel, 309 



Declination, 729 

 magnetic, 468 

 Definitions: astronomy, 729 

 atomic physics, 653 

 blackbody, 79 

 electric: 10-20 



international units, 20 

 1948 units, 20 

 electromagnetic, 10 

 gas laws, 259 

 geomagnetism, 468, 469 

 geometric, 4 

 heat, 7 



illumination, 93 

 magnetic, 10, 451 

 magnetism, 451 

 mechanical, 4 

 nuclear, 653 

 photography, 562 

 photometry, 93 

 physical properties, 187 

 radiation, 79 

 temperature, 9, 70 

 viscosity, 319 

 Degeneration (see Artificial disintegration) 

 Delaunay's y, 729 

 Delta rays, 653 



Demagnetization factor for rods, 467 

 Denier, 242 

 Density, 5, 291 

 air, 269, 270 

 moist, 598 

 alloys, 293 

 API, 290 



aqueous solutions, 300 

 alcohol, ethyl, 302 



methyl, 304 

 cane sugar, 304 



Baume and Brix degrees, 305 

 sulfuric acid, 304 

 Baume scale, 305 

 Brix, 305 

 calcite, 48 

 castor oil, 322 

 critical, 276 

 earth, 48 



variation with depth, 739 

 elements, 291 

 liquids, 291 

 solids, 291 

 ethyl-alcohol mixtures, 302 

 gases (various units), 269 

 gasolene, 322 

 glycerol-water, 321 

 hydrocarbons, 329 

 inorganic compounds, 120 

 kerosene, 295 

 leather, 233 

 liquids, 295 



methyl alcohol and water solutions, 304 

 cane sugar, 304 

 sulfuric acid, 304 

 mercury, 299 



and volume, 299 



Density — continued 

 minerals, artificial, 294 



natural, 294 

 organic compounds, 122 

 photographic, 562 

 planets, 734 

 plastics, 238, 239 

 reduction in air to vacuum, 69 

 salts, 531 

 satellites, 734 

 solids, various, 292 

 cgs, 292 

 English, 292 

 stars, high, 753, 762 



low, 753, 762 

 sugar: Baume degree, 305 

 Brix, 305 

 solutions, 304, 305 

 sulfuric acid and water solutions, 304 

 sun, 731 

 vapors, 269 

 water, 295, 296 

 air-free, 296 

 and volume, 298 

 woods, 246, 258 

 Derivatives and integrals, 23 

 Deuterium, 653 

 Deuteron, 653 



Developers, photographic, 563 

 Deviation in experimental data (see under 

 Data), average, 37 

 standard, 37 

 Diamagnetic elements, temperature effect, 



461 

 Diamagnetic substance, 451 

 susceptibility, 451 

 temperature effects, 461 

 Diatomic constants, 586 

 Diatomic molecules, 586 

 energy: electronic, 586 

 rotational, 586 

 formula, 586 

 vibrational, 586 

 formula, 586 

 level, 589 

 states, 586, 589 



molecular constants, 587 

 Dielectric constant (specific inductive ca- 

 pacity), 10, 423 

 air, 423, 424 



pressure, 422, 424 

 alcohol, 424 

 ceramics, 437 

 crystals, 437 

 clamped, 430 

 free, 430 

 elastomers, 438 

 gases, 423, 424 

 liquefied, 426 

 nonpolar, 436 

 pressure, 424 

 temperature, 423 

 glasses, 427 

 guttapercha, 427 

 ice, 427 



