230 Neutral buoyancy .................................................... 74, 98 Nitrogen Composition in air ................................................... 94 Ingassing ................................................................ 124 Offgassing ............................................................... 124 Residual .................................................................. 128 Nitrogen narcosis ......................................................... 117 Nitrox ..................................................................... 95, 118 No-decompression limits ............................................. 125 No-decompression tables ............................................. 127 O Octopus method, sharing air by ................................... 77 Octopus regulator .......................................................... 26 Offgassing nitrogen ..................................................... 124 Omitted decompression ............................................... 139 Oral inflator, buoyancy compensator ........................... 33 Orientation, site ........................................................... 178 Over heating ................................................................ 161 Overexertion ................................................................. 166 Overexpansion injuries................................................ 112 Overhead environment ................................................ 177 Oxygen ................................................................. 114, 117 Oxygen toxicity ............................................................ 117 P Packing for a dive ........................................................ 155 Personal buoyancy .................................................. 97, 98 Personal flotation .......................................................... 19 Planning Site orientation ....................................................... 178 Water temperature.................................................. 181 Planning worksheet ......See Dive planning worksheet Plants, entanglement in .............................................. 162 Plastic trash bags, conservation and .......................... 191 Pneumothorax ............................................................. 113 Pony bottle ..................................................................... 27 Popular diving areas ................................................... 192 Positive buoyancy .......................................................... 98 Pounds per square inch (psi) ..................................... 101 Power inflator, buoyancy compensator ........................ 57 Precautionary decompression stop ....................... 76, 128 Pregnancy and diving ..................................................... 9 Pressure Absolute .................................................................. 102 Air ............................................................................ 101 Ambient .................................................................... 25 Atmospheric ............................................................ 102 Blocks...................................................................... 107 Boyle’s law .............................................................. 103 Characteristics Air .......................................................................... 94 Density ................................................................... 94 Definition................................................................ 101 Effect On air spaces ....................................................... 106 On density ........................................................... 104 On volume ........................................................... 102 Equalization methods ............................................ 107 Equalizing ears ...................................................... 107 Fresh water ............................................................. 101 Gauge, submersible ...................................... 27, 28, 56 Indirect effects Carbon monoxide toxicity .................................. 118 Decompression sickness ...................................... 116 Ingassing and offgassing .................................... 116 Nitrogen narcosis ................................................ 117 Oxygen toxicity ................................................... 117 Salt water ................................................................ 101 Squeezes.................................................................. 107 Units........................................................................ 102 Volume relationships ............................................. 102 Pressure relief disk ......................................................... 23 Problems Air starvation .......................................................... 165 Choking and coughing .......................................... 164 Cramps.................................................................... 162 Disorientation and vertigo ..................................... 163 Entanglements ....................................................... 162 Equipment difficulties............................................ 163 Heat loss .................................................................. 160 Method of solving ................................................... 160 NAUI Scuba Diver INDEX
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