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                       Health. See Cancer; Human body; Medicine; Safety  Humus, 506             Inertia
                       Hearing, and sound waves, 122, 123   Hurricanes, 549, 577–79               defined, 25
                       Heat. See also Specific heat; Temperature;   Hutton, James, 478, 494, 529  horizontal motion, 34, 35
                           Thermodynamics                   Huygens, Christian, 189, 191          law of, 41
                         caloric theory of, 107             Huygens spacecraft, 388               mass and weight, 5, 43
                         defined, 85, 93                    Hydration, 280, 505                   work and energy, 69, 70
                         energy and molecular theory, 98–103  Hydrocarbons, See also Fossil fuels; Petroleum  Inertial confinement, of nuclear waste, 345
                         energy transfer, 93–94              air pollution, 267                 Infrared laser, 131
                         flow, 85, 96–98, 99                 combustion and balanced equations, 259  Infrared radiation, 71, 243
                         kinetic molecular theory, 86–88     defined, 300–302                   Infrasonic sound, 122
                         measurement, 85, 94                 derivatives of, 299, 307–11        Initial velocity, 31
                         mechanical equivalent of, 76       Hydrochloric acid, 285, 286, 289, 290, 513  Inner transition elements, 219
                         temperature, 92–93                 Hydrogen                            Inorganic chemistry, 300
                       Heat death, of universe, 107          alkali elements, 216               Inorganic compound, 300
                       Heat engine, 104, 105, 106            alternative energy sources, 80     In phase, and waves, 126
                       Heat of formation, 234                atomic weight, 207                 Insoluble substances, 279
                       Heat of fusion, 279                   covalent compounds, 237, 238       Instantaneous speed, 27
                       Heat islands, and weather, 573, 584, 585  electron configuration, 215    Insulation, and heat flow, 96, 97
                       Heat pump, 105, 106                   electron dot notation, 218         Insulators, electrical, 142–43
                       Heat radiation, 71, 243               electronegativity, 239             Insulin, 312
                       Heat of vaporization, 279             energy level diagram, 210          Intangible objects, 2
                       Heisenberg uncertainty principle, 214  ion, 235                          Intensity, of sound wave, 127
                       Heliocentric model, of solar system, 396–99  isotopes, 326               Interference, of waves, 126–27, 189–90
                       Heliostats, 78                        mass number, 207                   Interference pattern, 190
                       Helium, 123, 215, 218                 radius of atom, 627, 628           Interglacial warming period, 587
                       Hemoglobin, 312                       reducing agents, 260               Intergovernmental Panel on Climate Change (IPCC), 589
                       Henry, Joseph, 161                    replacement reactions, 261, 262    Intermediate-focus earthquakes, 485
                       Heptane, 303, 306, 307                speed of sound in, 123             Intermittent stream, 599
                       Herodotus, 522                        valence, 244                       Internal energy, 92, 93, 104, 106
                       Hertz (Hz), 117                       water molecules, 277               Internal potential energy, 99
                       Hertz, Heinrich, 197                 Hydrogen bonding, 278               Internal restoring force, 116
                       Hertzsprung, Ejnar, 358              Hydrogen carbonate, 236             International Astronomical Union (IAU), 378, 398
                       Hertzsprung-Russell diagram, 351, 358  Hydrogen chloride, 237, 284–85, 288  International date line, 416–17, 418
                       Hess, Harry, 469                     Hydrogen peroxide, 253, 281–82      International System of Units (SI), 5, 333
                       Hexane, 302, 303, 307                Hydrogen sulfate, 236               Intertropical convergence zone, 552
                       Hexyl group, 307                     Hydrogen sulfide, 490               Intrusive igneous rocks, 442, 492
                       High-density polyethylene (HDPE), 316  Hydrologic cycle, 544, 566, 567, 598–99  Inverse, and equations, 623
                       High humidity, 554                   Hydronium ion, 284–85, 288, 289     Inverse proportion, 10, 42
                       High latitudes, 413, 580, 581        Hydropower, 74, 76–77               Inverse square, 11
                       High-level nuclear waste, 344, 345   Hydrostatics, 544                   Inversion, of atmospheric temperature, 547
                       High-pressure weather systems, 572, 574, 575  Hydroxide(s), 437, 631     Invert sugar, 312
                       High-quality energy, 106             Hydroxide ion, 236, 241, 289        Investigations, scientific, 14–16
                       Himalayan Mountains, 466, 489        Hyperopia, 186                      Io (Jupiter), 386
                       Hipparchus, 355                      Hypochlorite, 236, 241              Iodide, 631
                       Historical geology, 522, 535         Hypothalamus, 90                    Iodine, 235, 330, 334, 337, 338
                       Hogback, of volcano, 492             Hypothesis, 14–15                   Ion(s). See also Ionic bonds; Ionic compounds
                       Hole-in-the-wall sun calendar, 415                                         chemical bonds, 232–33
                       Holmes, Mary, 20                     I                                     electric charges, 141
                       Holmes, W. H., 514                   Ice. See also Sea ice                 mineral-forming processes, 440
                       Holmium, 219                          precipitation, 569                   names of variable-charge ions, 241
                       Holocene epoch, 532                   refraction of light, 185             noble gases, 218
                       Honesty, and scientific ethics, 16    specific heat, 96                    polyatomic ions, 236
                       Hooke, Robert, 385                   Ice ages, 587, 589, 616               of representative elements, 235
                       Horizontal displacement, of land, 487  Ice-crystal process, and precipitation, 569  of transition elements, 236
                       Horizontal motion, 34                Iceland, and plate tectonics, 464   Ion exchanger, and water softening, 291–92
                       Horizontal projectiles, 38–39, 40    Igneous rocks, 433, 441–43, 462     Ion exchange reactions, 262–63
                       Hornblende, 436, 438                 Immiscible fluids, 279              Ionic bonds
                       Horsepower, 65, 66                   Impact force, 48                      compounds and formulas, 235–36
                       Horst, 483                           Impulse, 48                           defined, 229, 233, 234
                       Hot air balloons, 258                Incandescent light, 178, 180          electronegativity, 239
                       Hot dry rock, 79                     Incident ray, 182, 183                energy and electrons in, 234–35
                       Hot water, and geothermal energy, 79  Inclination, of Earth’s axis, 408. See also Milankovitch   Ionic compounds, 235–36, 241–42, 252, 280
                       Household chemistry, 267, 311           cycles                           Ionization, 284
                       Household circuits, 168–70           Inclined plane, 64–65               Ionization counter, 331
                       Hubble, Edwin, 132, 358, 364, 365–66, 367  Incoherent motion, 106        Ionosphere, 547
                       Hubble’s law, 358, 365               Index fossils, 528, 531             Ion-polar molecule force, 280
                       Hubble Space Telescope, 362, 365, 393  Index of refraction, 185          Iridium, 337
                       Huggins, William, 132                Indian Ocean, 464, 489, 607         Iris, of eye, 186, 187
                       Human body. See also Ear and eardrum; Eye; Medicine;   India Plate, 488  Iron
                           Safety                           Indicated operations, in equations, 623, 624  atomic weight, 207
                         fossilized from Bronze Age, 524    Indirect solar gain, 101              conduction rate, 97
                         radiation exposure, 333, 334       Indium, 337                           density, 9
                         temperature, 90, 92                Indonesia, and tsunami of 2004, 488–89. See also Tambora  electrical conductors, 143
                         windchill factor, 550              Induction, and static electricity, 142  electron configuration, 221
                       Humidity, 554–55, 583–84             Industrial heating, 79                ions, 236, 241
                       I-7                                                                                           Index   707
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