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VIII. On the Change in the Volumes and Refractive Indices of 

 Fluids produced by Hydrostatic Pressure. By Professor G. 

 Quincke*. 



TN order to determine the compressibility of a liquid, the 

 apparent decrease in the unit volume was measured which 

 the liquid showed at 0° and at a mean temperature of t D when 

 the pressure on the liquid was increased by an amount mea- 

 sured by means of a mercury-manometer, the liquid being 

 contained in a glass vessel provided with a capillary tube 

 under the receiver of an air-pump. The change in volume of 

 the containing glass vessel was determined by separate expe- 

 riments, and added to the apparent change in volume of the 

 liquid so as to determine the absolute decrease in volume of 

 the liquid. Both of these changes were found nearly propor- 

 tional to the increase in pressure. From these data we obtain 

 the actual decrease of unit volume of the liquid for an increase 

 in pressure of one atmosphere, or the compressibility of the 

 fluid at 0° and at t°. 



Compressibility, or decrease of volume of Fluids produced by 

 a Hydrostatic Pressure of one Atmosphere, in millionths of 

 the original volume. 



Fluid. 



Glycerine 



Rape-oil 



Almond-oil 



Olive-oil 



Water 



Sulphide of carbon 



Turpentine 



Benzol from benzoic acid 



Benzol 



Bock-oil 



Alcohol 



Ether 



p- 



10 6 . 



Tempera- 

 ture t°. 







At0°. 



At*°. 





volume. 



volume. 





24-24 



25-10 



19-00 



48-02 



58-18 



17-80 



48-21 



56-30 



19-68 



48-59 



61-74 



18-30 



50-30 



45-63 



22-93 



53-92 



63-78 



17-00 



58-17 



77-93 



18-56 





66-10 



16-78 





62-84 



16-08 



64-99 



74-50 



19-23 



82-82 



95-95 



17-51 



115-57 



147*72 



21-36 



The change in the refractive index at the temperature t° for 

 the same liquids was determined when the pressure on the 



* Translated from the Sitzungsberichte der honiglich preussischen Aha- 

 demie der Wissenschaften of Berlin, April 1883. 



Phil Mag. S. 5. Vol. 17. No. 103. Jan. 1884, F 



