BETWEEN THE VISCOSITY OP LIQUIDS AND THEIR CHEMICAL NATURE. 479 
Ethylene Bromide. CHoBr.CH„Br. 
A considerable quantity of ethylene dlbromide was dried over phosphoric oxide and 
frozen. By repeated freezing and partial liquefaction a fraction was eventually 
obtained which melted constantly at 9°'25. This was again dried over phosphoric 
oxide and distilled; it boiled between 130°'28 and 130°’G0. Bar. 761'2 millims. 
Corrected and reduced b.p. = 130°’39, 
Vapour density : 
Found, 93’07 Calculated, 9374. 
Observations for viscosity :— 
Left limb. 
Right limb. 
Temp. 
Press. 
Corr. 
>]■ 
Temp. 
Press. 
Corr. 
'}■ 
0 
9-48 
130-07 
-000038 
-0-20511 
9-51 
129-45 
-000038 
•020543 
20-66 
129-73 
-000046 
-016964 
20-61 
129-62 
-000046 
■017005 
31-27 
130-51 
-000053 
-014440 
31-16 
130-36 
-000053 
•014463 
41-64 
130-03 
-000061 
-012508 
41-64 
129-95 
-000061 
•012529 
51-93 
129-65 
-000068 
-010980 
51-69 
129-46 
-000068 
•011006 
62-97 
129-01 
-000076 
-009655 
62-78 
128-84 
-000076 
•009685 
73-44 
129-71 
-000085 
-008623 
73-53 
129-49 
-000085 
•008624 
85-95 
129-56 
-000094 
-007607 
85-80 
1-29-42 
-000094 
•007632 
95-86 
129-46 
-000102 
-006939 
95-77 
1-29-26 
-000102 
•006940 
105-74 
129-38 
-000110 
-006336 . 
105-68 
1-29-17 
-000110 
■006342 
117-08 
129-45 
-000119 
-005769 : 
116-75 
129-25 
-000119 
•005782 
126-71 
129-51 
-00U127 
-005323 
126-72 
129-29 
-000127 
■005321 
In reducing the observations the value 2'2132 for the density at 0°, and the 
expression 
V = 1 + -03952845^ + -06683455^3 + -083947^® 
for the thermal expansion, were adopted (Thorpe, loc. cit.). 
Taking 
= -020527 -q^ = -005322 -q.^ (calculated) = *010452 
= 9°-49 ^3 = 126°*7l ^ 2 (from curve) = 56°-08, 
we obtain the formula 
30-535 
yt = 
(80-802 + t) 
1-6322 ’ 
which gives the following calculated values :— 
