﻿Determination 
  of 
  a 
  Constant 
  in 
  Capillarity. 
  

   Chloro-benzene. 
  

  

  41 
  

  

  

  

  

  ExlO 
  

  

  T. 
  

  

  E. 
  

  

  L. 
  

  

  or 
  

  

  423 
  

  

  59-8 
  

  

  

  KlO-i. 
  

  

  65-81 
  

  

  21-4 
  

  

  433 
  

  

  59-9 
  

  

  64-12 
  

  

  21-6 
  

  

  443 
  

  

  60-0 
  

  

  6302 
  

  

  21-5 
  

  

  453 
  

  

  600 
  

  

  61-46 
  

  

  21-5 
  

  

  463 
  

  

  59-3 
  

  

  59-97 
  

  

  21-3 
  

  

  473 
  

  

  58-fi 
  

  

  58-31 
  

  

  21-3 
  

  

  483 
  

  

  58-1 
  

  

  56-81 
  

  

  21-2 
  

  

  493 
  

  

  57-4 
  

  

  55-29 
  

  

  21-1 
  

  

  503 
  

  

  56-7 
  

  

  53-83 
  

  

  20-9 
  

  

  513 
  

  

  55-9 
  

  

  52-43 
  

  

  20-8 
  

  

  523 
  

  

  551 
  

  

  50-81 
  

  

  20-7 
  

  

  533 
  

  

  53-8 
  

  

  49-09 
  

  

  20-6 
  

  

  (3) 
  

  

  the 
  equation 
  

  

  \u2/'^ 
  = 
  A(Te-T-a), 
  .... 
  

  

  where 
  v 
  denotes 
  the 
  molecular 
  volume 
  of 
  the 
  liquid, 
  and 
  A 
  

   IS 
  a 
  constant 
  which 
  is 
  practically 
  the 
  same 
  for 
  all 
  liquids, 
  

   ])eing 
  equal 
  to 
  about 
  2*1, 
  Tc 
  is 
  the 
  critical 
  temperature, 
  and 
  

   a 
  is 
  another 
  constant 
  which 
  is 
  also 
  approximately 
  the 
  same 
  

   ibr 
  all 
  liquids, 
  its 
  mean 
  value 
  being 
  about 
  5. 
  Substitutino- 
  

   for 
  \ 
  in 
  equation 
  (1) 
  by 
  means 
  of 
  equation 
  (3), 
  we 
  obtain 
  

  

  E 
  = 
  A 
  

  

  (Te- 
  

  

  -T-g) 
  ^ 
  AT 
  2 
  (T,-T-a) 
  ^ 
  

  

  Let 
  us 
  suppose 
  that 
  \ 
  refers 
  to 
  a 
  temperature 
  much 
  below 
  

  

  the 
  critical 
  temperature 
  of 
  the 
  liquid, 
  say 
  near 
  the 
  absolute 
  

  

  civ 
  

   zero. 
  The 
  value 
  of 
  -^ 
  is 
  then 
  a 
  very 
  small 
  fraction, 
  and 
  

  

  T(Te— 
  T— 
  a) 
  small 
  in 
  comparison 
  with 
  (T,-T-a). 
  The 
  

   third 
  term 
  on 
  the 
  right-hand 
  side 
  of 
  the 
  last 
  equation 
  may 
  

   at 
  low 
  temperatures 
  be, 
  therefore, 
  neglected 
  in 
  comparison 
  

   with 
  the 
  other 
  terms, 
  and 
  in 
  that 
  case 
  

  

  E 
  = 
  

  

  ^2/3^T,-«) 
  

  

  m 
  

  

  die 
  re 
  

  

  The 
  molecular 
  volume 
  is 
  given 
  by 
  t'= 
  — 
  , 
  

  

  molecular 
  weight 
  and 
  p 
  the 
  density 
  of 
  the 
  liquid, 
  

   stituting 
  for 
  v 
  in 
  the 
  last 
  equation 
  we 
  have 
  

  

  is 
  the 
  

   Sub- 
  

  

  ^^p^/3A( 
  T,-a) 
  

  

  