﻿2Q2 
  The 
  Viscosity 
  of 
  Water, 
  

  

  The 
  formula 
  which 
  best 
  represents 
  the 
  results 
  is 
  o£ 
  the 
  

   type 
  7]t=r](^ll 
  + 
  Kit-\-K^t^,hvit 
  it 
  is 
  found 
  that 
  the 
  range 
  of 
  

   temperature 
  for 
  each 
  set 
  of 
  constants 
  must 
  not 
  be 
  greater 
  

   than 
  25 
  degrees. 
  

  

  In 
  Table 
  B 
  are 
  given 
  the 
  constants 
  and 
  the 
  temperatures 
  

   to 
  which 
  they 
  apply, 
  in 
  connexion 
  with 
  the 
  above 
  formula. 
  

  

  Table 
  B. 
  — 
  Constants 
  in 
  the 
  formula 
  77^=770/1 
  + 
  A:if 
  + 
  /<:2^^. 
  

  

  Formula. 
  

  

  Temperature 
  

   limits. 
  

  

  K^. 
  K,. 
  

  

  1 
  

   ^0. 
  

  

  (1) 
  

  

  (2) 
  

  

  (3) 
  

  

  (4) 
  

  

  0°C.- 
  25* 
  C. 
  

   25° 
  C. 
  - 
  50° 
  C. 
  

   50° 
  C- 
  75° 
  C. 
  

   75° 
  0.-100° 
  C. 
  

  

  •03445 
  ; 
  -000235 
  

   •03544 
  ^000195 
  

   •0364 
  -000175 
  

  

  •0390 
  -000142 
  

  

  1 
  

  

  •01792S 
  

   -017928 
  

   •017928 
  

   -017928 
  

  

  Knibbs 
  * 
  has 
  tabulated 
  the 
  relative 
  "fluidities 
  (reciprocal 
  of 
  

   viscosity) 
  of 
  Poiseuille, 
  Graham, 
  Rosencranz, 
  Slotte, 
  Noack, 
  

   and 
  Thorpe 
  and 
  Rodger, 
  as 
  redetermined 
  by 
  himself; 
  and 
  if 
  

   my 
  results 
  be 
  treated 
  in 
  the 
  same 
  way 
  and 
  compared 
  with 
  the 
  

   mean 
  values, 
  it 
  will 
  be 
  seen 
  that 
  the 
  agreement 
  is 
  very 
  close 
  

   as 
  far 
  as 
  50° 
  C. 
  These 
  relative 
  values 
  are 
  given 
  in 
  Table 
  0. 
  

  

  

  Table 
  C 
  

  

  .—Relative 
  Fluidities 
  of 
  Water 
  0^ 
  C 
  — 
  

  

  100° 
  c. 
  

  

  

  j 
  

  

  Temp. 
  

  

  Poiseuille. 
  

   1846. 
  

  

  Gi-abam. 
  

   1861. 
  

  

  Rosencranz. 
  

   1877. 
  

  

  Slotte. 
  

   1883. 
  

  

  Noack. 
  

   1886. 
  

  

  Thorpe 
  & 
  

  

  Rodger. 
  

  

  1894. 
  

  

  Average 
  

   Values. 
  

  

  Hosking. 
  

  

  0°C. 
  

  

  1000 
  

  

  1000 
  

  

  1000 
  

  

  1000 
  

  

  1000 
  

  

  1000 
  

  

  1000 
  

  

  1000 
  

  

  5 
  

  

  1177 
  

  

  1183 
  

  

  ... 
  

  

  1181 
  

  

  1178 
  

  

  1176 
  

  

  1179 
  

  

  1178 
  

  

  10 
  

  

  1363 
  

  

  1369 
  

  

  

  1372 
  

  

  1375 
  

  

  1365 
  

  

  1369 
  

  

  1369 
  

  

  15 
  

  

  1557 
  

  

  1580 
  

  

  

  1574 
  

  

  1575 
  

  

  1562 
  

  

  1570 
  

  

  1569 
  

  

  20 
  

  

  1771 
  

  

  1796 
  

  

  ... 
  

  

  1785 
  

  

  1796 
  

  

  1772 
  

  

  1784 
  

  

  1782 
  

  

  25 
  

  

  1992 
  

  

  2021 
  

  

  ... 
  

  

  2005 
  

  

  2020 
  

  

  1992 
  

  

  2006 
  

  

  2008 
  

  

  30 
  

  

  2226 
  

  

  2240 
  

  

  ... 
  

  

  2233 
  

  

  2233 
  

  

  2225 
  

  

  2231 
  

  

  2241 
  

  

  35 
  

  

  2479 
  

  

  2493 
  

  

  ... 
  

  

  2473 
  

  

  2484 
  

  

  2466 
  

  

  2479 
  

  

  2477 
  

  

  40 
  

  

  2738 
  

  

  2758 
  

  

  2730 
  

  

  2717 
  

  

  2726 
  

  

  2716 
  

  

  2731 
  

  

  2730 
  

  

  45 
  

  

  3010 
  

  

  3018 
  

  

  3020 
  

  

  2961 
  

  

  2974 
  

  

  2976 
  

  

  2993 
  

  

  2988 
  

  

  50 
  

  

  ... 
  

  

  3308 
  

  

  3270 
  

  

  3214 
  

  

  3214 
  

  

  3246 
  

  

  3260 
  

  

  3260 
  

  

  65 
  

  

  

  3549 
  

  

  3540 
  

  

  3477 
  

  

  3479 
  

  

  3517 
  

  

  3512 
  

  

  3530 
  

  

  60 
  

  

  

  3834 
  

  

  3720 
  

  

  3744 
  

  

  3^ 
  

  

  -63 
  

  

  3797 
  

  

  3772 
  

  

  3823 
  

  

  65 
  

  

  

  4165 
  

  

  3980 
  

  

  4017 
  

  

  

  

  4086 
  

  

  4062 
  

  

  4112 
  

  

  70 
  

  

  

  4461 
  

  

  4210 
  

  

  4294 
  

  

  

  

  4385 
  

  

  4338 
  

  

  4414 
  

  

  75 
  

  

  ... 
  

  

  

  4430 
  

  

  4.571 
  

  

  

  

  4693 
  

  

  4565 
  

  

  4719 
  

  

  80 
  

  

  

  

  4620 
  

  

  4849 
  

  

  

  

  5003 
  

  

  4824 
  

  

  5037 
  

  

  85 
  

  

  

  

  

  5128 
  

  

  

  

  5316 
  

  

  5222 
  

  

  5352 
  

  

  90 
  

  

  ... 
  

  

  

  5460 
  

  

  5409 
  

  

  

  

  5633 
  

  

  5501 
  

  

  5674 
  

  

  95 
  

  

  

  ... 
  

  

  ... 
  

  

  5695 
  

  

  

  

  5955 
  

  

  5825 
  

  

  5977 
  

  

  100 
  

  

  

  

  ... 
  

  

  5983 
  

  

  

  

  6282 
  

  

  6132 
  

  

  6314 
  

  

  * 
  Journal 
  and 
  Proceedings 
  of 
  Koyal 
  Society 
  of 
  N. 
  S. 
  Wales, 
  vol. 
  xxx. 
  

  

  