﻿1875.] 
  

  

  Matter 
  in 
  the 
  Liquid 
  and 
  Gaseous 
  States, 
  

  

  519 
  

  

  Expansion 
  of 
  Heat 
  of 
  Carbonic 
  Acid 
  G-as 
  under 
  high 
  pressures. 
  

  

  Pressure, 
  

   at. 
  

  

  22-26 
  . 
  

  

  Vol. 
  C0 
  2 
  at 
  0° 
  & 
  

   760 
  millims. 
  = 
  l. 
  

  

  Vol. 
  C0. 
  2 
  at 
  6°-05 
  

   & 
  22-26 
  at. 
  = 
  1. 
  

  

  Temperature. 
  

  

  

  . 
  . 
  . 
  0-03934 
  . 
  , 
  

  

  . 
  . 
  . 
  1-0000 
  

  

  6-05] 
  

  

  

  22-26 
  . 
  

  

  . 
  . 
  . 
  0-05183 
  . 
  . 
  

  

  . 
  . 
  1-3175 
  

  

  63-79 
  \ 
  , 
  

  

  (A) 
  

  

  22-26 
  . 
  

  

  . 
  . 
  . 
  0-05909 
  . 
  , 
  

  

  , 
  . 
  . 
  1-5020 
  

  

  100-10 
  J 
  

  

  

  Pressure, 
  

   at. 
  

  

  31-06 
  . 
  

  

  Vol. 
  CO., 
  at 
  0° 
  & 
  

   760 
  miilims.=l. 
  

  

  Vol. 
  C0 
  2 
  at 
  6°-62 
  

   & 
  31-06 
  at. 
  = 
  l. 
  

  

  Temperature. 
  

  

  

  . 
  . 
  . 
  0-02589 
  . 
  , 
  

  

  , 
  . 
  . 
  1-0000 
  

  

  6-621 
  

  

  

  31-06 
  . 
  

  

  . 
  . 
  . 
  0-03600 
  . 
  , 
  

  

  , 
  . 
  . 
  1-3905 
  

  

  63-83 
  \ 
  . 
  

  

  (B) 
  

  

  31-06 
  . 
  

  

  . 
  . 
  . 
  0-04160 
  . 
  . 
  

  

  . 
  . 
  1-6068 
  . 
  . 
  . 
  . 
  

  

  100-64 
  J 
  

  

  

  Pressure, 
  

   at. 
  

  

  40-06 
  . 
  

  

  Vol. 
  C0 
  2 
  at 
  0° 
  & 
  

   760 
  millims. 
  = 
  l. 
  

  

  Vol. 
  C0 
  2 
  at 
  6°-01 
  

   & 
  40-06 
  at. 
  = 
  l. 
  

  

  Temperature. 
  

  

  

  . 
  . 
  . 
  0-01744 
  . 
  . 
  

  

  . 
  . 
  . 
  1-0000 
  

  

  6-01] 
  

  

  

  40-06 
  . 
  

  

  . 
  . 
  . 
  0-02697 
  . 
  . 
  

  

  . 
  . 
  1-5464 
  .... 
  

  

  63-64 
  \ 
  • 
  

  

  (C) 
  

  

  40-06 
  . 
  

  

  . 
  . 
  . 
  0-03161 
  . 
  . 
  

  

  . 
  , 
  1-8123 
  

  

  100-60 
  J 
  

  

  

  Taking 
  as 
  unit 
  1 
  vol. 
  of 
  carbonic 
  acid 
  at 
  6°-05 
  and 
  22*26 
  atmospheres, 
  

   we 
  obtain 
  from 
  series 
  A 
  the 
  following 
  values 
  for 
  the 
  coefficient 
  of 
  heat 
  

   for 
  different 
  ranges 
  of 
  temperature 
  : 
  — 
  

  

  a=0-005499 
  from 
  6°-05 
  to 
  63°'79. 
  

   a=0*005081 
  from 
  63°'79 
  to 
  100°-1. 
  

  

  From 
  series 
  B, 
  with 
  the 
  corresponding 
  unit 
  volume 
  at 
  6°-62 
  and 
  31*06 
  

   atmospheres, 
  we 
  find 
  : 
  — 
  

  

  a 
  =0*006826 
  from 
  6°-62 
  to 
  63°*83. 
  

   a 
  =0-005876 
  from 
  63°-83 
  to 
  100°-64. 
  

  

  And 
  in 
  like 
  manner 
  from 
  series 
  C 
  with 
  the 
  unit 
  volume 
  at 
  6°-01 
  and 
  

   40*06 
  atmospheres 
  : 
  — 
  

  

  a 
  = 
  0*009481 
  from 
  6°*01 
  to 
  63°*64. 
  

   a 
  = 
  0*007194 
  from 
  63°-64 
  to 
  100°*60. 
  

  

  The 
  coefficient 
  of 
  carbonic 
  acid 
  under 
  one 
  atmosphere 
  referred 
  to 
  a 
  

   unit 
  volume 
  at 
  6° 
  is 
  

  

  a=0*003629. 
  

  

  From 
  these 
  experiments 
  it 
  appears 
  that 
  the 
  coefficient 
  of 
  expansion 
  

   increases 
  rapidly 
  with 
  the 
  pressure. 
  Between 
  the 
  temperatures 
  of 
  6° 
  

   and 
  64° 
  it 
  is 
  once 
  and 
  a 
  half 
  as 
  great 
  uuder 
  22 
  atmospheres, 
  aud 
  more 
  

   than 
  two 
  and 
  a 
  half 
  times 
  as 
  great 
  under 
  40 
  atmospheres, 
  as 
  at 
  the 
  

   pressure 
  of 
  1 
  atmosphere. 
  Still 
  more 
  important 
  is 
  the 
  change 
  in 
  the 
  value 
  

   of 
  the 
  coefficient 
  at 
  different 
  parts 
  of 
  the 
  thermometric 
  scale, 
  the 
  pressure 
  

   remaining 
  the 
  same. 
  An 
  inspection 
  of 
  the 
  figures 
  will 
  also 
  show 
  that 
  this 
  

   change 
  of 
  value 
  at 
  different 
  temperatures 
  increases 
  with 
  the 
  pressure. 
  

  

  