G08 
MESSRS. T. E. THORPE AND J. W. RODGER ON THE RELATIONS 
The comparisons of the observed molecular viscosities and those calculated by means 
of the above fundamental constants are given in the following tables. 
In the first, Table A, are set out those compounds for which the agreement is fairly 
satisfactory. With respect to the agreement it must be borne in mind that errors 
incidental to the determination of the boiling-point, density, and thermal expansion, 
as well as of viscosity, may affect the observed values. 
In the second. Table B, are placed compounds which give differences which are far 
beyond the limits of the experimental errors involved. 
Molecular Viscosity at the Boiling-point. 
Table A. 
i 
Observed. 
Calculated. 
Difference 
per cent. 
Pentane . 
480 
470 
21 
Hexane. 
550 
532 
3-3 
Heptane. 
593 
594 
- 0-1 
' Octane. 
646 
656 
- 1'5 
Isopentane . 
489 
485 
o-s 
i Isohexane . 
551 
547 
0-7 
Isoheptane . 
588 
609 
- 3-6 
Amjlene. 
420 
438 
- 4-3 ; 
i 
1 
Methyl iodide. 
639 
662 
- 3-6 
Ethyl iodide. 
721 
724 
— OmI 
Propyl iodide. 
795 
786 
1-1 
, Isopropyl iodide. 
816 
801 
1-6 
Isobutyl iodide. 
862 
863 
- 0 1 
Allyl iodide. 
745 
739 
0-8 
i 
i 
Ethyl bromide. 
597 
624 
i 
- 4-5 ' 
Propyl bromide. 
686 
686 
0 
Isopropyl bromide. 
705 
701 
0-6 
Isohutyi bromide. 
761 
763 
- 0-3 
Ally] bromide. 
635 
639 
- 0-6 
Ethylene dibromide .... 
1089 
1082 
0-6 
I.sobutylene dibi’omide. 
1274 
1221 
4-2 ’ 
j 
1 Propyl chloride. 
557 
550 
]-2 
Isopropyl chloride. 
567 
565 
0-3 ^ 
Isohutyi chloride. 
657 
628 
4'4 
Allyl chloride. 
504 
503 
0-2 
Ethylidene dichloride .... 
674 
692 
- 2-7 i 
Carhon tetrachloride .... 
1077 
1038 
3-6 i 
