350 



Index of Subjects 



Matter, three states of, 2 

 Maxwell's Law of Distribution, see Law 

 Mean free path, see Free-paths 

 Mechanical illustrations: 

 General Theory, 4 

 Equipartition of energy, 92 

 Equalisation of temperature, 4, 110, 111 

 Dissipation of Energy, 174, 190 

 Partition of energy in non-conservative 



gas, 192 



Molecular action, sphere of, see Sphere 

 Molecular chaos, assumption of, 14 

 ,, ,, analysis of assumption, 54 

 ,, ,, justification when molecules are in- 

 finitely small, 57 

 ,, modification when molecules are of 



finite size, 58 

 relation of assumption to " continuity 



of path," 91 

 Molecules, mass of, 7 



number per c.c. , 6 

 ,, size of, see Size 

 velocity of, 113 

 Momentoids, definition of, 68 



,, partition of energy between, 69 



,, number of, 172 



Monatomic gases, 172, 223 



Non-conservative gas, general theory, 176 

 Normal state, 49 ; for non-conservative gas, 



190, 211 

 Number of molecules per c.c., 6 



Persistence of velocities after collision, 236 

 ,, ,, effect on coefficients of viscosity, 249 

 effect on conduction of heat, 267 

 ,, ,, effect on diffusion, 273 

 Planetary atmospheres, 309 

 Pressure in a gas, 105, 114, 119, 158, 331, 332 

 ,, calculated by the Virial, 143 

 ,, in a mixture of gases, 107 

 of vapour in equilibrium with liquid, 



3, 131, 330 



,, of radiation, 212 

 Pressure-coefficient of a gas, 138 

 Probability, use of calculus of, 13, 53 

 Propagation of sound, see Sound 



Radiation of gases, 208 



caused by electrical or chemical 



action, 209 



pressure of, 212 



Rate of dissipation of translational energy, 197 

 ,, ,, of planetary atmospheres, 318 



Ratio of Specific Heats, of a conservative gas, 



171 

 ,, ,, ,, of a non-conservative 



gas, 219 

 ,, ,, ,, experimental values, 



220, 221 



,, ,, gas in state of aggre- 



gation, 334 

 Refractive index in gases, 345 



>, size of molecules determined 



by, 345 



Relaxation, time of, 294, 297 

 Rotating gas, 67, 71 



Rotational energy of a molecule, 92, 192, 226 

 ,, ,, transfer of, 303 



Size of molecules, 339 



,, ,, determined from deviations from 



Boyle's Law, 139 



,, ,, determined from viscosity, 251 

 ,, ,, determined from coefficients of con- 

 duction and diffusion, 340 

 ,, ,, determined from densities of liquids 



and solids, 341 

 ,, ,, determined from specific inductive 



capacity, 344 

 apparent variation with temperature, 



254, 342 



Sorting demon of Maxwell, 168 

 Sound, propagation of, 228, 302 

 "Special state" of Schuster and Hemsalech, 



207 



Specific Heats of conservative gas, 169 

 ,, of non-conservative gas, 215 



,, of gas in state of aggregation, 



333 

 ,, ,, experimental values, 217, 218, 



334 



Specific Inductive Capacity of gas, 344 

 Spectroscopy, 172 

 Sphere of molecular action, 72 



,, loaded, as illustrative type of molecule: 

 ,, equipartition, conservative gas, 



92 



,, partition of energy, non-con- 



servative gas, 192 



,, propagation of sound, 302 



State, change of, 2 



,, continuity of, 114, 131, 329 

 Statistical mechanics, 91, 187 

 Statistical method, 11 



,, imperfections of, 12, 91, 



165 

 Steam, wet and dry, 334 



