302 



A Constant Pressure Gas Thermometer 



by means of strong sulphuric actd. The barometric height 

 remained constant at 76*96 cm. 



Temperature. Expansion. 



0° C c.c. 



10°-7 C 3-83 c.c. 



20°- 4 C. 7-5 c.c. 



30°-5 C 11-37 c.c. 



40° C 14-92 c.c. 



50° C 18-82 c.c. 



60°-l C 22-6 c.c. 



69°'5 C 26-06 c.c. 



79°-35C 29-94 c.c. 



90 o, 2 C 33-66 c.c. 



100°-4 C 37-56 c.c. 



Coefficient of expansion ='003741. 



35 



Oc 



Fig. 5. — Expansion of Hydrochloric Acid Gas. 





















/ 



































y 



y 

















/ 



y 

















A 



s 















s 



} 

 s 

















) 



Y 

















/ 



y* 



















10 



cO' 



70" 



40 50 60 70 



Temperature. - 



80 



$0 



100 c 



A graph on a small scale conveys no correct idea of the 

 regularity of the results. To test the results properly they 

 should be graphed on as large a scale as possible. 



