CONTENTS 



CHAPTEE VII 



VISCOSITY OF GASES 



SECTION PAG K 



73. ON THE CHARACTER OF INTERNAL AND EXTERNAL FRICTION. 171 



74. NEWTON'S FUNDAMENTAL LAW OF INTERNAL FRICTION . . 172 



75. FORMULA FOR THE COEFFICIENT OF VISCOSITY OF A GAS . 174 



76. THEORETICAL LAWS OF GASEOUS FRICTION . . . . 178 



77. OBSERVATIONS ON THE FRICTION OF GASES AT DIFFERENT 



PRESSURES 181 



78. NUMERICAL VALUES OF THE FREE PATH AND COLLISION- 



FREQUENCY OF PARTICLES OF AIR 188 



79. FREE PATH AND COLLISION-FREQUENCY OF THE PARTICLES OF 



DIFFERENT GASES 191 



80. VISCOSITY OF GASEOUS MIXTURES 200 



81. FRICTION OF GASES ON FIXED BODIES ..... 205 



82. THEORY OF EXTERNAL FRICTION 207 



83. COMPARISON OF THE THEORY WITH EXPERIMENT . . . 210 



84. PHENOMENA IN VERY RAREFIED GASES 212 



85. INFLUENCE OF THE TEMPERATURE ON THE VISCOSITY . . 215 



86. VISCOSITY OF VAPOURS 221 



87. DEPENDENCE ON THE TEMPERATURE 223 



88. DISSOCIATION . 228 



89. ALTERATION OF VISCOSITY BY DISSOCIATION .... 230 



90. COMPARISON OF THE THEORY WITH THE BEHAVIOUR OF 



CARBONIC ACID 233 



91. VISCOSITY OF THE PERFECTLY-DISSOCIATED GAS AND OF THE 



NON-DISSOCIATED GAS 239 



92. TRANSITION INTO THE CRITICAL STATE. . . 244 



CHAPTEE VIII 



DIFFUSION OF GASES 



93. OBSERVATIONS 247 



94. GENERAL THEORY OF DIFFUSION 250 



95. THEORETICAL VALUE OF THE COEFFICIENT OF VISCOSITY . 251 



96. FREE PATH OF A GASEOUS MOLECULE IN A GAS OF DIFFE- 



RENT KIND 256 



97. MOLECULAR FREE PATH IN A GASEOUS MIXTURE . . . 259 



98. COEFFICIENT OF DIFFUSION 260 



99. ANOTHER THEORY OF DIFFUSION ...... 262 



100. OBSERVATIONS IN TEST OF THE THEORIES . . . . 264 



101. DEPENDENCE ON PRESSURE AND TEMPERATURE . . . 268 



102. CALCULATION OF THE COEFFICIENT OF DIFFUSION FROM THE 



COEFFICIENT OF VISCOSITY ....... 273 



