﻿156 
  

  

  Prof. 
  Kuerten 
  and 
  Mr. 
  Robson 
  on 
  

  

  vapour 
  and 
  liquid 
  -vapour 
  curves. 
  The 
  two 
  points 
  thus 
  found 
  

   are 
  identical, 
  the 
  triple-point 
  temperature 
  being 
  therefore 
  

   — 
  56°*2 
  C, 
  and 
  the 
  pressure 
  5*10 
  atmos. 
  Faraday 
  found 
  

   -57° 
  C. 
  and 
  5J 
  atmos., 
  and 
  Cailletet 
  -54 
  *6C. 
  and 
  5'3 
  

   atmos. 
  We 
  have 
  no 
  direct 
  experimental 
  data 
  for 
  the 
  liquid- 
  

   solid 
  curve, 
  except 
  that 
  it 
  is 
  a 
  curve 
  rising 
  towards 
  the 
  

   right, 
  solid 
  carbon 
  dioxide 
  being 
  denser 
  than 
  liquid. 
  

  

  In 
  Tables 
  III. 
  and 
  IV. 
  we 
  give 
  our 
  results 
  for 
  ethane. 
  We 
  

  

  Table 
  III. 
  — 
  Vapour-Pressures 
  of 
  Ethane. 
  

  

  Temperature. 
  

  

  Pressure 
  (Atinos.). 
  

  

  

  

  I 
  2361 
  

   1 
  23-97 
  

  

  - 
  9-74 
  

  

  1 
  18-40 
  

   1 
  18-57 
  

  

  -15 
  06 
  

  

  16-08 
  

  

  -2111 
  

  

  1364 
  

  

  -26-24 
  

  

  11-80 
  

  

  -32-88 
  

  

  9-78 
  

  

  -33-24 
  

  

  953 
  

  

  -3793 
  

  

  8-22 
  

  

  -43-45 
  

  

  6-89 
  

  

  -50-87 
  

  

  5-38 
  

  

  -57-84 
  

  

  4-21 
  

  

  - 
  72-21 
  

  

  2-33 
  

  

  -78-46 
  

  

  1-83 
  

  

  Table 
  IV. 
  — 
  Vapour-Pressures 
  of 
  Ethane 
  (read 
  from 
  curve). 
  

  

  Temperature. 
  

  

  Pressure. 
  

  

  i 
  

  

  

  

  Atmospheres. 
  

  

  Metres 
  of 
  Mercury. 
  

   179 
  

  

  236 
  

  

  — 
  5 
  

  

  20-7 
  

  

  15-7 
  

  

  -10 
  

  

  18-2 
  

  

  13-8 
  

  

  -15 
  

  

  160 
  

  

  12-2 
  

  

  -20 
  

  

  14-0 
  5 
  

  

  10-7 
  

  

  -25 
  

  

  12-2 
  

  

  9-27 
  

  

  -30 
  

  

  105 
  

  

  7-98 
  

  

  -35 
  

  

  9-05 
  

  

  6-88 
  

  

  -40 
  

  

  7 
  80 
  

  

  5-93 
  

  

  -45 
  

  

  6-67 
  

  

  507 
  

  

  -50 
  

  

  5-60 
  

  

  4-26 
  

  

  -55 
  

  

  4-61 
  

  

  3-50 
  

  

  -60 
  

  

  3-79 
  

  

  2-88 
  

  

  -65 
  

  

  3-10 
  

  

  2-36 
  

  

  -70 
  

  

  2-5S 
  

  

  1-96 
  

  

  -75 
  

  

  210 
  

  

  1-60 
  

  

  