﻿Adsorption 
  of 
  Hydrogen 
  hy 
  Carbon. 
  

   Table 
  IV. 
  

  

  921 
  

  

  ' 
  Kemarks. 
  

  

  Time. 
  

  

  Pressure. 
  

  

  Difference. 
  

  

  Put 
  in 
  7 
  1 
  "59 
  c.c. 
  (corr. 
  ) 
  

  

  0-1 
  minute. 
  

  

  29 
  mm. 
  

  

  

  Took 
  out 
  28-40 
  c.c. 
  (corr.) 
  .. 
  

  

  4-14 
  minutes. 
  

  

  

  

  

  

  

  loi- 
  „ 
  

  

  7'51 
  mm. 
  

  

  — 
  1 
  

  

  

  

  7-57 
  .. 
  

  

  +00(5 
  mm. 
  

  

  

  19i 
  „ 
  

  

  7-59 
  „ 
  

  

  +008 
  „ 
  

  

  

  21^ 
  „ 
  

  

  7-61 
  „ 
  

  

  +010 
  „ 
  

  

  

  23^ 
  

  

  7-60 
  „ 
  

  

  +009 
  „ 
  

  

  

  25^ 
  „ 
  

  

  7-68 
  „ 
  

  

  +0-07 
  „ 
  

  

  

  27 
  „ 
  

  

  7-57 
  „ 
  

  

  +0-06 
  „ 
  i 
  

  

  

  50 
  

  

  7-47 
  „ 
  

  

  -0-04 
  „ 
  j 
  

  

  

  5 
  hours. 
  

  

  7-20 
  „ 
  

  

  -0-31 
  „ 
  1 
  

  

  

  IS 
  .. 
  , 
  

  

  7-28 
  ., 
  

  

  -0-23 
  „ 
  

  

  These 
  results 
  show 
  that 
  the 
  initial 
  rise 
  of 
  pressure 
  and 
  the 
  

   subsequent 
  fall 
  are 
  quite 
  real. 
  Before 
  discussing 
  the 
  extent 
  

   of 
  their 
  significance 
  it 
  may 
  be 
  ^\e\\ 
  to 
  point 
  out 
  under 
  what 
  

   conditions 
  this 
  effect 
  may 
  be 
  masked. 
  

  

  It 
  is 
  clear 
  that 
  diffusion 
  into 
  the 
  interior 
  must 
  set 
  in 
  

   immediately 
  on 
  contact 
  of 
  the 
  gas 
  with 
  the 
  carbon, 
  and 
  that 
  

   it 
  will 
  be 
  most 
  active 
  at 
  first. 
  For 
  not 
  only 
  is 
  diffusion 
  

   quickest 
  at 
  first 
  (as 
  shown 
  by 
  the 
  laws 
  of 
  diffusion), 
  but 
  in 
  

   addition 
  the 
  pressure 
  is 
  at 
  first 
  much 
  greater 
  than 
  after 
  a 
  

   fraction 
  of 
  the 
  gas 
  has 
  been 
  pumped 
  out 
  from 
  the 
  apparatus 
  

   in 
  the 
  course 
  of 
  the 
  next 
  few 
  minutes. 
  Thus 
  if 
  the 
  initial 
  

   exposure 
  at 
  the 
  relatively 
  high 
  pressure 
  be 
  too 
  prolonged, 
  or 
  

   if 
  not 
  sufficient 
  gas 
  to 
  cause 
  a 
  very 
  decided 
  change 
  in 
  the 
  

   pressure 
  be 
  pumped 
  out, 
  or 
  further 
  if 
  the 
  gas 
  is 
  removed 
  too 
  

   slowly, 
  the 
  chief 
  phenomenon 
  observed 
  will 
  only 
  be 
  the 
  steady 
  

   fall 
  of 
  pressure 
  due 
  to 
  the 
  absorption 
  of 
  the 
  hydrogen 
  by 
  the 
  

   carbon. 
  This 
  is 
  shown 
  in 
  the 
  following 
  three 
  experiments. 
  

  

  Table 
  Y. 
  

  

  Eemarks. 
  

  

  Time. 
  

  

  Pressure. 
  

  

  1 
  

   Difference. 
  

  

  Put 
  in 
  77'55 
  c.c. 
  (corr.) 
  

  

  0-1 
  minute. 
  

  

  48-0 
  mm. 
  

  

  _ 
  

  

  Took 
  out 
  24-76 
  c.c. 
  (corr.) 
  .. 
  

  

  2-6 
  minutes. 
  

  

  — 
  

  

  

  

  

  n 
  ., 
  

  

  1553 
  mm. 
  

  

  — 
  

  

  

  9^^ 
  ,, 
  

  

  15-56 
  ., 
  

  

  +0-03 
  mm. 
  

  

  

  lU 
  „ 
  

  

  15-50 
  , 
  

  

  -0-03 
  „ 
  

  

  

  13i 
  „ 
  

  

  15-40 
  „ 
  

  

  -013 
  „ 
  

  

  

  17-1 
  „ 
  

  

  15-26 
  „ 
  

  

  -0-27 
  „ 
  

  

  

  2H 
  ,. 
  

  

  15-15 
  „ 
  

  

  -0-38 
  „ 
  

  

  

  20| 
  „ 
  

  

  15-06 
  ., 
  

  

  -0-47 
  „ 
  

  

  

  39 
  ., 
  

  

  14-a3 
  „ 
  

  

  -0-70 
  „ 
  

  

  

  83 
  

  

  14-43 
  „ 
  

  

  -1-10 
  „ 
  

  

  

  6^ 
  hours. 
  

  

  13-61 
  „ 
  

  

  -1-92 
  „ 
  

  

  

  21" 
  ,, 
  

  

  14-62 
  „ 
  

  

  -0-91 
  „ 
  

  

  