﻿Properties 
  of 
  Carbon 
  Dioxide 
  and 
  of 
  Ethane. 
  625 
  

  

  contains 
  carbon 
  tetrachloride 
  and 
  stannic 
  chloride, 
  to 
  which 
  

   substances 
  we 
  have 
  already 
  found 
  it 
  to 
  bear 
  a 
  close 
  resem- 
  

   blance, 
  and 
  the 
  deviations 
  'from 
  the 
  diameter 
  law 
  are 
  also 
  of 
  

   the 
  same 
  sense 
  as 
  for 
  the 
  other 
  substances 
  in 
  the 
  group. 
  

   Carbon 
  dioxide 
  thus 
  confirms 
  Young's 
  generalization 
  on 
  this 
  

   head. 
  

  

  Volume 
  of 
  Saturated 
  Vapour 
  below 
  0° 
  C. 
  — 
  By 
  the 
  law 
  of 
  corre- 
  

   sponding 
  states 
  we 
  may 
  now 
  deduce 
  the 
  volumes 
  of 
  the 
  vapour 
  

   below 
  0° 
  C. 
  with 
  a 
  fair 
  degree 
  of 
  accuracy. 
  It 
  is 
  unlikely 
  

   that 
  the 
  results 
  thus 
  obtained 
  should 
  be 
  more 
  than 
  a 
  few 
  

   per 
  cent, 
  wrong. 
  The 
  following 
  table 
  contains 
  the 
  results 
  at 
  

   the 
  reduced 
  pressures 
  occurring 
  in 
  Young's 
  tables 
  corre- 
  

   sponding 
  to 
  temperatures 
  below 
  0° 
  C. 
  (Arnagat's 
  result 
  for 
  

   0° 
  C. 
  has 
  been 
  added.) 
  The 
  volume 
  of 
  the 
  saturated 
  vapour 
  

   should 
  be 
  slightly 
  smaller 
  than 
  the 
  volume 
  calculated 
  by 
  the 
  

   gaseous 
  laws 
  from 
  the 
  data 
  at 
  0° 
  C. 
  and 
  one 
  atmosphere. 
  This 
  

   appears 
  to 
  be 
  the 
  case. 
  For 
  — 
  65°*7 
  C. 
  the 
  volume 
  so 
  calcu- 
  

   lated 
  is 
  120 
  as 
  compared 
  with 
  113, 
  at 
  — 
  37°*5 
  the 
  figures 
  are 
  

   41 
  and 
  35'9, 
  and 
  at 
  — 
  2°'3 
  the 
  figures 
  are 
  15*65 
  and 
  11'21. 
  

  

  Table 
  II. 
  

  

  Eeduced 
  

   Pressure. 
  

  

  Temp. 
  

  

  Vapour 
  

   Volume. 
  

  

  Liquid 
  

   Volume. 
  

  

  dp 
  

   di' 
  

  

  Latent 
  Heat. 
  

  

  Calc. 
  

  

  Mathias. 
  

  

  •02241 
  

  

  o 
  

  

  215 
  

  

  

  

  

  

  •04482 
  

  

  -657 
  

  

  113 
  

  

  •83 
  

  

  •165 
  

  

  95-3 
  

  

  836 
  

  

  •08846 
  

  

  -50-4 
  

  

  58-6 
  

  

  •86 
  

  

  •272 
  

  

  84-7 
  

  

  80-4 
  

  

  •1474 
  

  

  -37-5 
  

  

  35-9 
  

  

  •90 
  

  

  •390 
  

  

  78-0 
  

  

  76-5 
  

  

  •2064 
  

  

  -27-8 
  

  

  256 
  

  

  •94 
  

  

  •490 
  

  

  72-0 
  

  

  72-7 
  

  

  •2949 
  

  

  -16-4 
  

  

  17-56 
  

  

  •93 
  

  

  •648 
  

  

  68-4 
  

  

  67-2 
  

  

  •4423 
  

  

  - 
  2-3 
  

  

  11-21 
  

  

  ro7 
  

  

  •877 
  

  

  58-4 
  

  

  58-2 
  

  

  — 
  

  

  

  

  10-42 
  

  

  109 
  

  

  •907 
  

  

  56-0 
  

  

  56-5 
  

  

  •5899 
  

  

  4- 
  8-9 
  

  

  7-77 
  

  

  116 
  

  

  1-078 
  

  

  48-8 
  

  

  48-6 
  

  

  Latent 
  Heat 
  of 
  Evaporation. 
  — 
  Having 
  obtained 
  the 
  volume 
  

   of 
  saturated 
  vapour, 
  we 
  may 
  now 
  calculate 
  the 
  latent 
  heat 
  of 
  

   evaporation 
  of 
  the 
  liquid 
  by 
  the 
  formula 
  

  

  l=(,^)t|. 
  

  

  The 
  value 
  of 
  the 
  liquid 
  volume 
  is 
  taken 
  from 
  Behn's 
  tables, 
  

  

  and 
  ■— 
  we 
  determined 
  directly 
  from 
  our 
  vapour-pressure 
  

  

  curve. 
  In 
  this 
  manner 
  the 
  values 
  contained 
  in 
  Table 
  II. 
  

   were 
  obtained. 
  

  

  