118 



Messrs. Nichols and Wheeler on the Coefficient 

 Table III. (continued). 





Percentage of NH 3 



Percentage of NH 3 



Water (pure)*. 





in solution = 



in solution = 



Percentage of 



Tempera- 

 tures. 



5*()1 per cent. 



2*12 per cent. 



NH 3 =0-00. 



Volumes. .Coefficients. 



Volumes. 



Coefficients. 



Volumes. 



o 



20 



1-003228 



•000264 



1-002038 



•000198 



1-001744 



18 



1-002725 



•000252 



1-001653 



•000187 



1-001348 



16 



1-002205 



•000236 



1-001319 



•000173 



1-000999 



14 



1001765 



■000223 



1-000919 



•000155 



1000701 



12 



1-001338 



•000206 



1-000689 



•000137 



1-000451 



10 



1-000941 



•000189 



1-000432 



•000116 



1-000345 



8 



1-000585 



•000172 



1-000237 



•000095 



1000114 



6 



1-000281 



•000153 



1-000120 



•000071 



1-000030 



4 



1-000000 



•000132 



1-000000 



•000046 



1-000000 



2 



0-999703 



•000110 



0-999945 



•000017 



1-000073 







0-999500 



•000087 



0-999949 



-•000017 





- 2 



0-999362 



•000064 



1-000043 



- -000058 



Frozen. 



- 4 



0-999285 



•000041 



1-000173 



- -000180 





- 6 



0-999199 



•000016 









- 8 



0-999167 



-•000013 



Frozen. 







-10 



0999280 

 Frozen. 











Curves showing the coefficients of expansion are given in 

 fig. 3. The temperatures are abscissae, the coefficients or- 

 dinates. These curves are valuable in the determination of 

 the points of maximum density of the solutions. They cut the 

 base-line at those points, thus fixing the temperatures to within 

 a small fraction of a degree; while from the volume-curves 

 (which are parallel to the base-line at the points of maximum 

 density) it is impossible to determine the latter with any 

 accuracy. 



The solutions of 2*12, 5*61, and 7-96 per cent, strength 

 were frozen within the temperature-interval under observa- 

 tion ; but the stronger solutions remained fluid to below 

 — 20° C. The following Table gives the saturation-points, 

 points of maximum density, and freezing-points of the solu- 

 tions in question. 



* Rosetti's table, PoggendorfFs Annalen, Bd. v. 



