﻿906 
  Dr. 
  Kleeman 
  : 
  Relations 
  between 
  Critical 
  Constants 
  

  

  equal 
  to 
  3*70. 
  Comparing 
  this 
  with 
  the 
  theoretical 
  form 
  o£ 
  

   the 
  equation, 
  we 
  see 
  that 
  

  

  H2 
  A' 
  

  

  On 
  putting 
  R 
  equal 
  to 
  %2'& 
  x 
  10^ 
  and 
  the 
  mean 
  values 
  for 
  M 
  

   and 
  H 
  from 
  Tables 
  I. 
  and 
  II., 
  A 
  is 
  found 
  to 
  be 
  equal 
  to 
  3*66, 
  

   which 
  agrees 
  well 
  with 
  the 
  value 
  given 
  by 
  Young 
  and 
  Thomas. 
  

  

  Table 
  II. 
  

  

  Name 
  of 
  liquid. 
  

  

  Absolute 
  

   critical 
  

   tempe- 
  

   rature. 
  

  

  H= 
  

  

  ^CaKpcl 
  

  

  1 
  

  

  Name 
  of 
  liquid. 
  

  

  Absolute 
  

   critical 
  

   tempe- 
  

   rature. 
  

  

  H 
  = 
  

  

  Isopentane 
  

  

  460-8 
  

   470-3 
  

   507-8 
  

   539-9 
  

   569-2 
  

   500-4 
  

   543-8 
  

   559-5 
  

   670-0 
  

   721-0 
  

   6330 
  

   5530 
  

   591-7 
  

   561-5 
  

   467-4 
  

   533-8 
  

   522-5 
  

   628-7 
  

   549-2 
  

   545-4 
  

   551-0 
  

   540-5 
  

  

  25-41 
  

  

  25 
  25 
  

   24-82 
  

   25-25 
  

   24-56 
  

   28-95 
  

   23 
  73 
  

   23-23 
  

   25-72 
  

   25-58 
  

   •25-30 
  

   23-36 
  

   25-03 
  

   25-29 
  

   2504 
  

   24-56 
  

   24-60 
  

   24-68 
  

   23-83 
  

   24-28 
  

   24-13 
  

   23-35 
  

  

  Isobutyl 
  formate 
  

  

  Carbon 
  tetrachloride 
  ... 
  

  

  Hydrochloric 
  acid 
  

  

  Carbon 
  dioxide 
  

  

  551-2 
  

   556-11 
  

   325-3 
  

   304-3 
  

   565-8 
  

   553-4 
  

   561-3 
  

   566-7 
  

   575-6 
  

  

  561-4 
  

   523-0 
  

   505-9 
  

   503-0 
  

   487-0 
  

  

  24-31 
  

  

  25-48 
  : 
  

  

  29-41 
  i 
  

  

  21-13 
  

  

  23-97 
  

  

  23-72 
  

  

  23-59 
  

  

  23-82 
  

  

  23-83 
  

  

  27-43 
  

  

  27-83 
  

   23-82 
  

   25-38 
  

   25-77 
  

  

  1 
  

  

  Pentane 
  

  

  Hexane 
  

  

  Heptane 
  

  

  Octane 
  . 
  

  

  1 
  Ethvl 
  buty 
  rate 
  

  

  Di-isopropyl 
  

  

  Ethy 
  1 
  i 
  sob 
  uty 
  rate 
  

  

  \ 
  Isobutyl 
  acetate 
  

  

  ! 
  Methyl 
  valerate 
  

  

  Di-isobutvl 
  

  

  Fluor-benzene 
  

  

  Brouio-benzene 
  

  

  Amyl 
  formate 
  

  

  Monochlorinated 
  chlo- 
  

   rideof 
  ethyl 
  

  

  lodo-benzene 
  

  

  Tlexf 
  TT1 
  efli 
  y1 
  en 
  p. 
  

  

  i 
  Chloraldehyde 
  

  

  Stannic 
  chloride 
  

  

  Methyl 
  acetate 
  

  

  Benzene 
  

  

  i 
  Ethyl 
  formate 
  

  

  Ether 
  

  

  1 
  Methyl 
  formate 
  

  

  

  

  Ethyl 
  acetate 
  

  

  Methyl 
  propi 
  onate 
  

  

  1 
  

  

  Mean 
  ... 
  

  

  24-88 
  

  

  Water 
  

  

  637-3 
  

   513-0 
  

   .5367 
  

   594-6 
  

  

  62-05 
  

   34-37 
  : 
  

  

  28-25 
  ■ 
  

   28-40 
  : 
  

  

  1 
  

  

  

  Methyl 
  alcohol 
  

  

  Methyl 
  buty 
  rate 
  

  

  Methyl 
  isobutyrate 
  

  

  

  

  j 
  

  

  If 
  we 
  apply 
  equation 
  (4) 
  to 
  liquids 
  below 
  their 
  critiacl 
  

   temperatures 
  the 
  agreement 
  obtained 
  is 
  not 
  so 
  good. 
  The 
  

   reason 
  appears 
  to 
  be 
  that 
  pressures 
  at 
  corresponding 
  tempe- 
  

   ratures 
  are 
  only 
  roughly 
  equal 
  to 
  the 
  same 
  fraction 
  of 
  their 
  

   critical 
  values 
  which 
  w^as 
  supposed 
  to 
  bold 
  exactly 
  in 
  deducing 
  

   equation 
  ("4) 
  from 
  equation 
  (3). 
  That 
  the 
  agreement 
  is 
  best 
  

   at 
  the 
  critical 
  state 
  w^ould 
  then 
  indicate 
  that 
  the 
  pressures 
  

   for 
  corresponding 
  temperatures 
  become 
  more 
  nearly 
  corre- 
  

   sponding 
  pressures 
  as 
  w^e 
  approach 
  the 
  critical 
  point. 
  The 
  

   equation 
  (3) 
  should 
  therefore 
  apply 
  better 
  to 
  a 
  liquid 
  in 
  the 
  

   form 
  in 
  wdiich 
  it 
  stands. 
  

  

  When 
  the 
  temperature 
  is 
  sufficiently 
  below 
  the 
  critical 
  

  

  