Index 



325 



Relative density, definition of, 65 

 Respiration of fish, 248 

 Respired air, carbon dioxide in, 232 

 Results, degree of accuracy of, 11; 



method of checking, 7 

 Retort, tubulated, 266 

 Reversible reactions, 298 

 Rusting, conditions of, 247, 248; 



oxygen absorbed in, 215; part 



played by carbon dioxide, 248 

 Rust, nature of, 217, 248 

 Rutherford's thermometers, 150, 



151 



Saltpetre, action of heat on, 253 



Salts, acid, 315; basic, 316; for- 

 mation of, 310, 313; reactions 

 of, 311, 312 



Sand-bath, 269 



Saturated solution, 272; prepara- 

 tion of, 271 



Scale of temperature, absolute, 

 156; Fahrenheit, 147; Centi- 



Jrade, 147; Reaumur, 147 

 38, 5 



Scale, use of, 6 



Silica, 309 



Silicic acid, 309 



Silicon dioxide, 309 



Siphon barometer, 99 



Six's thermometer, 151 



Snow, poor conductor of heat, 186 



Sodium, action of water on, 280 



Sodium bicarbonate, 315; chloride, 



preparation, 313 

 Sodium, colour of flame of, 281 ; 



combustion in oxygen, 257; 



hydroxide, 258, 259, 281; 



hyposulphite, 233 ; peroxide, 



258 ; precautions in using, 257 ; 



sulphate, 273 ; thiosulphate, 233 

 Solidification, heat evolved during, 



166, 273 

 Solids, diffusion of, 76 ; properties 



of, 70, 71 

 Solubility, effect of temperature 



on, 271 ; method of testing, 278 

 Solubility of liquids, 278 

 Soluble and insoluble substances, 



method of separation, 275 

 Solution, heat absorbed during, 



180, 233; preparation of satu- 



rated, 271; removal of gases 

 from, 245; saturated, 272; 

 supersaturated, 272 



Solutions, boiling-point of, 178; 

 freezing-point of, 180 



Soot in air, 241 



Specific gravities, table of, 68; 

 gravity, definition of, 65, dis- 

 tinction from density, 65 



Specific gravity of irregular solids, 

 90; liquids, 91; milk, 94 



Specific heat, 162; calculations 

 involving, 163 



Specific heats, table of, 163 



Sphere, volume of, 37 



Spring-balance, 45 



Square centimetre, relation to 

 square inch, 27; decimetre, com- 

 parison with square foot, 22 



Squared paper, testing accuracy 

 of, 31; use in curve plotting, 

 236 ; use in estimating areas, 28 



Stability, degrees of, 114; re- 

 lation to the centre of gravity, 

 113 



Stable equilibrium, 114 



Standard units, 2 



States of matter, intermediate 

 forms, 81 



Steam, action on iron, 281, mag- 

 nesium, 281 ; composition of, 

 300 ; constant temperature of, 

 168, 179; pressure when con- 

 fined, 175 



Steam -trap, 171 



Steam, volume Compared with 

 that of water, 61 



Steelyard, method of graduation, 

 61 ; principle of, 61 ; weights 

 for, 61 



Still, 270 



Straight lines, measurement of, 6 



Substance, definition of, 43 



Sulphur, combustion in oxygen, 256 



Sulphur dioxide, action on water, 

 258 ; preparation of, 256 ; pre- 

 sence in air, 241 



Sulphuretted hydrogen, presence 

 in air, 241 



Sulphuric acid, 258 ; use as drying 

 agent, 240, 296 



Sulphurous acid, 256, 258 



