﻿Coefficient 
  of 
  Diffusion. 
  

  

  873 
  

  

  each 
  4 
  cms. 
  long, 
  but 
  of 
  different 
  cross-section, 
  as 
  shown 
  in 
  

   the 
  table 
  below. 
  

  

  Using 
  10 
  per 
  cent. 
  KN0 
  3 
  solution, 
  the 
  following 
  results 
  

  

  were 
  obtained 
  using 
  these 
  tubes 
  :■ 
  

  

  Experiment. 
  

  

  «AxlO 
  G 
  

   Mean 
  Slope. 
  

  

  *Xl0 
  5 
  . 
  

  

  Mean 
  value 
  

   &X 
  105. 
  

  

  L. 
  

  

  A. 
  

  

  16 
  

  

  •2154 
  

   •2159 
  

  

  •1294 
  

   •1316 
  

  

  •0956 
  

  

  •0959 
  

  

  •843 
  

   •845 
  

  

  •836 
  

   •850 
  

  

  •852 
  

   •855 
  

  

  j 
  -844 
  

  

  j 
  -843 
  

  

  1 
  -853 
  

   j 
  

  

  4-00 
  

  

  3-990 
  

  

  3-993 
  

  

  1-094 
  

   1-024 
  

   0-743 
  

  

  17 
  

  

  18 
  

  

  19 
  

  

  20 
  

  

  2J 
  

  

  

  The 
  results 
  obtained, 
  using 
  different 
  tubes, 
  do 
  not 
  vary 
  

   more 
  than 
  the 
  individual 
  experiments 
  on 
  the 
  same 
  tube, 
  so 
  

   that 
  for 
  the 
  present 
  at 
  any 
  rate 
  we 
  may 
  neglect 
  any 
  end 
  

   correction 
  to 
  our 
  tubes 
  of 
  4 
  cms. 
  length. 
  The 
  results 
  also 
  

   suggest 
  that 
  the 
  vessel 
  containing 
  the 
  water 
  is 
  large 
  enough 
  ; 
  

   for, 
  although 
  the 
  quantity 
  of 
  salt 
  diffused 
  into 
  the 
  water 
  

   varies 
  considerably, 
  the 
  quantity 
  in 
  the 
  last 
  case 
  being 
  less 
  

   than 
  half 
  that 
  in 
  the 
  first, 
  yet 
  we 
  get 
  approximately 
  the 
  same 
  

   calculated 
  value 
  for 
  the 
  coefficient 
  of 
  diffusion. 
  

  

  The 
  next 
  table 
  gives 
  the 
  results 
  for 
  5 
  per 
  cent, 
  solution 
  

   of 
  KNO 
  s 
  . 
  

  

  L=4-00 
  cms. 
  ; 
  A 
  = 
  T694 
  sq. 
  cms. 
  N=gms. 
  KN0 
  3 
  per 
  c.c. 
  solution 
  at 
  0° 
  

  

  Experiment. 
  

  

  TS 
  T 
  . 
  

  

  *Axl0 
  e 
  . 
  

  

  h 
  x 
  10 
  5 
  . 
  

  

  Mean 
  /L-xlO 
  5 
  . 
  

  

  22 
  

  

  •0521 
  

   •0521 
  

  

  •1174 
  

   •1177 
  

  

  •870 
  

  

  •872 
  

  

  j 
  '871 
  

   j 
  

  

  23 
  

  

  Comparing 
  this 
  result 
  with 
  the 
  value 
  obtained 
  in 
  Experi- 
  

   ments 
  16 
  and 
  17 
  shown 
  in 
  the 
  previous 
  table, 
  we 
  see 
  that 
  

   the 
  coefficient 
  of 
  diffusion 
  of 
  KN0 
  3 
  increases 
  as 
  the 
  concen- 
  

   tration 
  decreases, 
  as 
  was 
  noticed 
  by 
  Scheffer 
  in 
  1888, 
  a 
  

   phenomenon 
  contrary 
  to 
  that 
  which 
  holds 
  for 
  KC1 
  and 
  NaCl. 
  

  

  The 
  results 
  obtained 
  with 
  solutions 
  of 
  KC1 
  are 
  tabulated 
  

   below. 
  

  

  