﻿624 
  Prof. 
  Kuenen 
  and 
  Mr. 
  Robson 
  on 
  the 
  Thermal 
  

  

  same 
  limits 
  as 
  other 
  non-associating 
  substances 
  carbon 
  dioxide 
  

   obeys 
  the 
  law 
  of 
  corresponding 
  states^ 
  and 
  is 
  thus 
  a 
  normal 
  

   substance. 
  

  

  Table 
  I. 
  

   Corresponding 
  States. 
  Carbon 
  Dioxide. 
  

  

  Reduced 
  

  

  Reduced 
  

  

  Reduced 
  

  

  Reduced 
  

  

  Pressure. 
  

  

  Temperature. 
  

  

  Liq. 
  Volume. 
  

  

  Vap. 
  Volume. 
  

  

  •04423 
  

  

  •681 
  KB. 
  

  

  •383 
  B. 
  

  

  

  •08846 
  

  

  •731 
  „ 
  

  

  •401 
  „ 
  

  

  

  •1474 
  

  

  '774 
  „ 
  

  

  •420 
  „ 
  

  

  

  •2064 
  

  

  •806 
  „ 
  

  

  •435 
  „ 
  

  

  

  •2949 
  

  

  •843 
  „ 
  

  

  •457 
  „ 
  

  

  

  •4423 
  

  

  •889 
  „ 
  

  

  •495 
  „ 
  

  

  

  •5899 
  

  

  •926 
  A. 
  

  

  f 
  -535 
  „ 
  \ 
  

   { 
  -537 
  A. 
  J 
  

  

  3-61 
  A. 
  

  

  •7372 
  

  

  •956 
  „ 
  

  

  •590 
  „ 
  

  

  2-64 
  „ 
  

  

  •8257 
  

  

  •972 
  „ 
  

  

  •633 
  „ 
  

  

  2-16 
  „ 
  

  

  •8846 
  

  

  •982 
  „ 
  

  

  •671 
  „ 
  

  

  1-86 
  „ 
  

  

  •9436 
  

  

  •991 
  „ 
  

  

  •730 
  „ 
  

  

  1-57 
  „ 
  

  

  1-0000 
  

  

  1000 
  

  

  1-000 
  

  

  1-00 
  

  

  Law 
  of 
  Density 
  Diameter. 
  — 
  Owing 
  to 
  the 
  absence 
  from 
  the 
  

   table 
  of 
  vapour 
  volumes 
  below 
  0° 
  C, 
  the 
  diameter 
  law 
  of 
  

   Cailletet 
  and 
  Mathias 
  cannot 
  be 
  tested 
  completely 
  below 
  0° 
  C. 
  

   It 
  is 
  well 
  known 
  that 
  Amagat's 
  results 
  for 
  temperatures 
  above 
  

   0° 
  C. 
  agree 
  with 
  this 
  law. 
  It 
  is 
  easy 
  to 
  show 
  that 
  the 
  

   law 
  does 
  not 
  hold 
  accurately 
  below 
  0° 
  C., 
  and 
  in 
  what 
  di- 
  

   rection 
  the 
  deviation 
  lies. 
  We 
  have 
  only 
  to 
  produce 
  the 
  

   diameter 
  as 
  deduced 
  from 
  Amagat's 
  numbers 
  down 
  towards 
  

   low 
  temperatures 
  : 
  it 
  is 
  found 
  that 
  the 
  mean 
  density 
  thus 
  

   obtained 
  at 
  — 
  60° 
  C. 
  is 
  less 
  than 
  half 
  the 
  value 
  of 
  the 
  liquid 
  

   density, 
  and 
  this 
  would 
  lead 
  to 
  a 
  negative 
  value 
  for 
  the 
  vapour 
  

   density. 
  We 
  are 
  thus 
  driven 
  to 
  the 
  conclusion 
  that 
  the 
  dia- 
  

   meter 
  is 
  not 
  a 
  straight 
  line 
  and 
  is 
  slightly 
  convex 
  towards 
  the 
  

   temperature 
  axis. 
  

  

  This 
  result 
  for 
  carbon 
  dioxide 
  agrees 
  with 
  recent 
  results 
  

   obtained 
  by 
  Young* 
  with 
  regard 
  to 
  the 
  same 
  law. 
  Young 
  

   finds 
  that, 
  with 
  the 
  exception 
  of 
  normal 
  pentane 
  for 
  which 
  the 
  

   diameter 
  is 
  a 
  straight 
  line, 
  all 
  substances 
  show 
  slight 
  deviations 
  

   on 
  one 
  side 
  or 
  the 
  other, 
  according 
  to 
  whether 
  the 
  ratio 
  of 
  the 
  

   critical 
  density 
  to 
  the 
  theoretical 
  density 
  is 
  smaller 
  or 
  larger 
  

   than 
  the 
  ratio 
  for 
  normal 
  pentane 
  — 
  3*765. 
  For 
  carbon 
  

   dioxide 
  this 
  ratio 
  is 
  3' 
  61, 
  and 
  is 
  thus 
  smaller 
  than 
  any 
  of 
  the 
  

   numbers 
  in 
  Young's 
  table; 
  the 
  group 
  into 
  which 
  it 
  falls 
  

  

  * 
  Phil. 
  Mag. 
  [5] 
  1. 
  p. 
  291. 
  

  

  