﻿and 
  certain 
  Quantities 
  connected 
  with 
  Capillarity. 
  907 
  

  

  point, 
  the 
  value 
  o£ 
  p 
  in 
  equation 
  (3) 
  may 
  be 
  neglected 
  in 
  

   comparison 
  with 
  pc- 
  Omitting 
  j» 
  and 
  combining 
  equation 
  (3) 
  

   with 
  equation 
  (1)^ 
  we 
  obtain 
  

  

  

  U. 
  

  

  (5) 
  

  

  where 
  U 
  is 
  a 
  constant 
  which 
  is 
  the 
  same 
  for 
  all 
  liquids 
  at 
  

   corresponding 
  states. 
  The 
  value 
  of 
  — 
  for 
  values 
  of 
  L 
  and/o 
  

  

  pc 
  

  

  at 
  temperatures 
  equal 
  to 
  f 
  T 
  is 
  calculated 
  for 
  a 
  number 
  of 
  

   liquids 
  (Table 
  III.) 
  . 
  The 
  constancy 
  of 
  — 
  does 
  not 
  appear 
  

  

  Pc 
  

  

  to 
  be 
  very 
  good. 
  

  

  Table 
  III. 
  

  

  ;N"ame 
  of 
  liquid. 
  

  

  Di-isopropyl 
  

  

  Di-isobutjl 
  ;. 
  

  

  Pentane 
  

  

  I 
  opentane 
  

  

  Hexane 
  

  

  Heptane 
  

  

  Octane 
  

  

  Fluoi'-benzene 
  

  

  Bromo-benzene 
  

  

  lodo-benzene 
  

  

  Chloro-beuzene 
  

  

  Hexamethylene 
  

  

  Stannic 
  cliloride 
  

  

  Benzene 
  

  

  Ether 
  

  

  Propyl 
  formate 
  

  

  Ethyl 
  acetate 
  

  

  Methyl 
  propionate 
  . 
  

  

  Propyl 
  acetate 
  

  

  Ethyl 
  propionate 
  

  

  Methyl 
  butyrate 
  .... 
  

   Methyl 
  isobutyrate 
  . 
  

   Carbon 
  tetrachloride 
  

  

  Methyl 
  acetate 
  

  

  Ethyl 
  formate 
  

  

  i?c. 
  

  

  P- 
  

  

  ■ 
  

   L. 
  

  

  U= 
  

  

  1 
  30-72 
  

  

  •6237 
  

  

  69-39 
  

  

  

  1 
  24-55 
  

  

  •6333 
  

  

  66-05 
  

  

  

  ! 
  33-03 
  

  

  •6057 
  

  

  75-47 
  

  

  

  32-92 
  

  

  •6048 
  

  

  71-09 
  

  

  

  ! 
  29-62 
  

  

  •6167 
  

  

  72-61 
  

  

  

  1 
  26-86 
  

  

  •6247 
  

  

  71-40 
  

  

  1- 
  

  

  i 
  24-64 
  

  

  -6299 
  

  

  66-05 
  

  

  1- 
  

  

  i 
  44-62 
  

  

  -9233 
  

  

  69-71 
  

  

  1-- 
  

  

  ! 
  44-62 
  

  

  1-2792 
  

  

  48-84 
  

  

  1--^ 
  

  

  1 
  44-62 
  

  

  1-5347 
  

  

  40-79 
  

  

  

  1 
  44-62 
  

  

  •9611 
  

  

  65-88 
  

  

  

  39-8 
  

  

  -7047 
  

  

  76-25 
  

  

  

  1 
  36-95 
  

  

  1-9597 
  

  

  27-11 
  

  

  

  47-89 
  

  

  •7826 
  

  

  81-73 
  

  

  

  36-28 
  

  

  •6907 
  

  

  75-44 
  

  

  

  42-7 
  

  

  -8304 
  

  

  78-35 
  

  

  

  39-65 
  

  

  •8305 
  

  

  78-61 
  

  

  l-( 
  

  

  39-88 
  

  

  -8408 
  

  

  79-72 
  

  

  l-( 
  

  

  33-17 
  

  

  •8046 
  

  

  74-30 
  

  

  l-{ 
  

  

  34-64 
  

  

  •8071 
  

  

  74-38 
  

  

  1-' 
  

  

  36-02 
  

  

  •8147 
  

  

  71-07 
  

  

  l-( 
  

  

  33-88 
  

  

  •8102 
  

  

  69-74 
  

  

  l-( 
  

  

  44-97 
  

  

  1^4385 
  

  

  39-87 
  

  

  

  47-54 
  

  

  •8741 
  

  

  89-08 
  

  

  l-( 
  

  

  48-70 
  

  

  •8658 
  

  

  86-93 
  

  

  1'* 
  

  

  

  The 
  difference 
  between 
  the 
  internal 
  specific 
  heat 
  of 
  a 
  Hquid 
  

   and 
  that 
  of 
  its 
  saturated 
  vapour 
  (i. 
  e. 
  the 
  heat 
  capacity 
  of 
  unit 
  

   mass 
  less 
  the 
  work 
  done 
  in 
  overcoming 
  external 
  pressure) 
  

   can 
  be 
  thrown 
  into 
  a 
  form 
  which 
  may 
  be 
  useful 
  for 
  some 
  

   purposes 
  by 
  means 
  of 
  equation 
  (1). 
  

  

  Let 
  S' 
  and 
  S" 
  denote 
  the 
  internal 
  specific 
  heat 
  of 
  the 
  

  

  