﻿Properties 
  of 
  Carbon 
  Dioxide 
  and 
  of 
  Ethane. 
  G2^> 
  

  

  The 
  above 
  are, 
  so 
  far 
  as 
  we 
  are 
  able 
  to 
  judge, 
  the 
  most 
  

   trustworthy 
  data 
  for 
  carbon 
  dioxide. 
  We 
  must 
  here 
  refer 
  to 
  

   some 
  researches 
  which 
  escaped 
  our 
  notice 
  until 
  after 
  our 
  

   former 
  paper 
  was 
  published. 
  Vapour-pressures 
  of 
  solid 
  

   carbon 
  dioxide 
  at 
  pressures 
  below 
  and 
  just 
  above 
  one 
  atmo- 
  

   sphere 
  were 
  measured 
  by 
  du 
  Bois 
  and 
  Wills 
  *. 
  Although 
  

   their 
  value 
  for 
  the 
  boiling-point 
  is 
  probably 
  less 
  accurate 
  

   than 
  ours, 
  which 
  is 
  in 
  complete 
  agreement 
  with 
  Holborn's 
  

   value, 
  their 
  results 
  are 
  of 
  importance 
  for 
  determining 
  the 
  

   direction 
  of 
  the 
  vapour-pressure 
  curve 
  at 
  and 
  below 
  the 
  

   boiling-point 
  : 
  and 
  for 
  that 
  purpose 
  they 
  have 
  been 
  used 
  in 
  

   this 
  paper. 
  Vapour-pressures 
  and 
  triple-point 
  constants 
  were 
  

   determined 
  by 
  Villard 
  and 
  Jarry 
  f. 
  As 
  determined 
  by 
  them, 
  

   the 
  triple 
  point 
  is 
  at 
  — 
  5fi 
  0, 
  7 
  0. 
  and 
  5*1 
  atmospheres 
  (our 
  

   values 
  are 
  — 
  56°'24 
  C. 
  and 
  5*10 
  atmos.); 
  the 
  boiling-point 
  

   they 
  find 
  to 
  be 
  -79° 
  C, 
  our 
  result 
  being 
  -78°'32 
  0. 
  The 
  

   slight 
  difference 
  in 
  the 
  temperatures 
  may 
  be 
  due 
  to 
  their 
  

   having 
  used 
  a 
  toluene 
  thermometer. 
  Their 
  pressures 
  were 
  

   measured 
  on 
  a 
  metal 
  gauge. 
  Lastly, 
  we 
  must 
  mention 
  a 
  

   research 
  by 
  Tammannt 
  on 
  the 
  fusion-curve 
  of 
  carbon 
  dioxide. 
  

   Tammann's 
  results 
  will 
  be 
  compared 
  with 
  ours 
  later 
  in 
  this 
  

   paper. 
  

  

  Law 
  of 
  Corresponding 
  States. 
  — 
  We 
  have 
  first 
  of 
  all 
  ascer- 
  

   tained 
  how 
  far 
  the 
  substance 
  obeys 
  the 
  law 
  of 
  corresponding- 
  

   states. 
  Owing 
  to 
  Young's 
  researches 
  §, 
  the 
  comparison 
  can 
  

   be 
  made 
  with 
  much 
  greater 
  facility 
  now 
  than 
  at 
  the 
  time 
  

   when 
  the 
  law 
  was 
  first 
  enunciated 
  by 
  van 
  der 
  Waals 
  ||. 
  

  

  The 
  following 
  table 
  (p. 
  624) 
  contains 
  the 
  reduced 
  boiling- 
  

   points, 
  liquid 
  volumes, 
  and 
  vapour 
  volumes 
  at 
  the 
  same 
  corre- 
  

   sponding 
  pressures 
  as 
  used 
  by 
  Young, 
  deduced 
  from 
  the 
  

   researches 
  enumerated 
  above. 
  (Amagat 
  = 
  ^, 
  Behn 
  = 
  B, 
  and 
  

   Kuenen-Robson 
  = 
  K.R.) 
  

  

  In 
  comparing 
  the 
  second, 
  third, 
  and 
  fourth 
  columns 
  of 
  the 
  

   table 
  with 
  the 
  first, 
  second, 
  and 
  third 
  tables 
  in 
  Young's 
  paper, 
  

   it 
  is 
  found 
  that 
  there 
  is 
  no 
  systematic 
  divergence 
  from 
  the 
  

   other 
  substances. 
  The 
  temperatures 
  are 
  approximately 
  the 
  

   means 
  of 
  those 
  for 
  carbon 
  tetrachloride 
  and 
  stannic 
  chloride: 
  

   the 
  liquid 
  volumes 
  agree 
  with 
  those 
  of 
  stannic 
  chloride, 
  

   and 
  are 
  1 
  or 
  1^ 
  per 
  cent, 
  below 
  the 
  volumes 
  of 
  carbon 
  tetra- 
  

   chloride 
  ; 
  while 
  the 
  vapour 
  volumes 
  are 
  between 
  ^ 
  and 
  

   1 
  per 
  cent, 
  below 
  those 
  of 
  carbon 
  tetrachloride. 
  Within 
  the 
  

  

  * 
  du 
  Bois 
  and 
  Wills, 
  Verhandl. 
  der 
  D. 
  Phys. 
  Gesellschaft, 
  i. 
  p. 
  168. 
  

   t 
  Villard 
  and 
  Jarry, 
  Compt. 
  Hend. 
  cxx. 
  p. 
  1418. 
  

   \ 
  Tammann, 
  Wied. 
  Ann. 
  lxviii. 
  p. 
  569. 
  

   § 
  Young, 
  Phil. 
  Mag. 
  [o] 
  xxxvii. 
  p. 
  1, 
  &c. 
  

   || 
  van 
  der 
  Waals, 
  Die 
  Continuity 
  fyc. 
  1899, 
  p. 
  142. 
  

   i> 
  q 
  g 
  

  

  