1872.] 



of Mixtures of Methylic Alcohol and Water. 



339 



Section 5. Specific Gravity and Rate of Expansion. 



Table V. gives the specific gravities of the various mixtures at the tem- 

 peratures of 10° and 20° C, water at 4° C. taken as unit, together with the 

 calculated specific gravities at 10° C, and the difference between the 

 specific gravities as observed and calculated. 



Table VI. gives the expansion of 100 volumes of the mixtures when 

 heated from 10° to 20° C, calculated from the data of the previous Table. 

 The figures in column 4 are calculated on the assumption that the expan- 

 sion is proportional to the volumes of the constituents, the contraction 

 taking place on mixing being allowed for. 



Table V. 



Percentage 

 of methylic 

 alcohol, by 

 weight. 



Specific 

 gravity at 

 10° 0. 



Specific 

 gravity at 

 20° C. 



Specific 

 gravity at 

 10° 0., cal- 

 culated. 



Difference. 



O 

 10 



20 

 30 

 40 

 50 

 60 

 70 

 80 

 90 

 100 



99973 

 98632 

 97478 

 96222 

 94729 

 92991 

 91048 

 88933 

 86598 

 84054 

 81371 



99819 

 98384 

 97080 

 95675 

 94054 

 92205 

 90207 

 88035 

 85655 

 83079 

 80334 



97762 



95622 



93573 



91611 



89727 



87923 



86188 ■ 



84520 



82916 



+ 870 

 1856 

 2649 

 3118 

 3264 

 3125 

 2745 

 2078 

 1138 



Table VI. 



Percentage 

 of methylic 

 alcohol, by 

 weight. 



Volume at 

 10° C. 



Volume at 

 20° C., found 



Volume at 

 20° C, cal- 

 culated. 



Difference. 





 10 

 20 

 30 

 40 

 50 

 60 

 70 

 80 

 90 

 100 



100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 



100-154 

 100-252 

 100-410 

 100-571 

 100-718 

 100-853 



100- 932 

 101019 



101- 101 

 101173 

 101-290 



100-293 



100 429 

 100-562 

 100-689 

 100-809 



100- 922 



101 028 



101- 124 

 101-212 



-0041 

 -0-019 

 +0-009 

 +0-029 

 +0044 

 +0010 

 -0009 

 -0023 

 -0039 



Section 6. Compressibility. 

 This is estimated by means of an apparatus similar to the one employed 

 by Regnault and Grassi. Instead of a reservoir of compressed air a 



