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alpha ray amount atmosphere atomic number atomic weight becomes beryllium Boyle's Law burning calories carbon carbon dioxide carbon monoxide cathode ray Chapter chemical reactions chemistry coal cohesion color combustion composed compounds cool cork cube cubic centimeter definite density depends distance earth effect electric electrons elements equal ether experiment fact flow fluorine force Frederick Soddy galaxy gamma rays gases give grams heat helium human hydrogen increase instance iron knowledge known layer length liquid lithium magnetic mass materials matter and energy means measure mercury metal meters miles molecular molecules motion nature nitrogen nucleus object orbits oxide oxygen particles Physics planets positive charge positive ray pressure produce properties question radium reflected Sir William Bragg solid space spectrum stars stream substance surface Svante Arrhenius temperature theory things tion tube understanding unit universe vacuum vapor vibrations volume wave-length waves X-ray