214 



DILATATION OF THE GASES, 



but not with 

 great attention 



jneafured in inches, Pried ley difcovered the dilatations of th<t 

 different gafes. As all thefe experiments were made with 

 the fame phial and tube, which he probably always inclined in 

 the fame angle, they gave a comparative refult between the 

 dilatations of the different gafes, but not the abfolute dilata- 

 tions ; becaufe for this purpofe he ought to have known the 

 capacity of the part of the tube paffed through by the mercury 

 relative to that of the phial, and to have known exactly the 

 inclination of the tube. Prieftley fays nothing of this. I will 

 no longer then difcufs his experiments ; particularly as Prieflley 

 himfelf does not place much confidence in them, and wi flies 

 them to be repeated in a better manner. 

 His refults as to Suppofing equal volumes of different gafes, the expanflons 



pn] e y| nCremCntS meafured in inches on the tube would be for 4°, 44 of the 

 thermometer divided into 80 parts. 



Inches. 



Common air » * r - 1,3^ 



Hidrogen gas - 2,05 



Nitrous gas 2,02 



Carbonic acid gas - 2,20 



Muriatic acid gas - - - J, 33 



Oxigen gas - - - 2,21 



Azote gas r « 1,65 



Sulphureous acid gas ? - -' 2,37 



Fluoric acid gas - - - -> 2^83 



Ammoniacal gas . - - 4,75 



(Exper. and Obfer. &c. Book VII. Se#. VI.) 



In a memoir printed among thofe of the Academy for the 

 year J 786, Citizens Monge, Berthollet, and Vandermonde, 

 * nd concluded from experiment, that for one degree, atmofpheric 

 air dilates T -g-?,TT °* * ts volume and hidrogen gas y^i.^. 



At length Cit. Guy ton confidering the variations in the re r 

 fults on the dilatation of atmofpheric air, and that there were 

 no direct experiments to determine the dilatation of gafes at 

 degrees of heat a little elevated or otherwife, undertook with 

 Cit. Duvernois to examine this obje6t. As their work is the 

 moft recent, I fhall endeavour for a moment to difcover 

 what may have affedied their refults. 



Their 



Vandermondei 

 Monge, and 

 Jterthollet on 

 common air 

 hidrogen. 



Guyton and 

 Duvernois/ 





