Constant Pressure Gas Thermometer. 301 



During the experiment the barometric pressure remained 

 constant at 77*00 cm. 



Temperature. Expansion. 



0° C C.C. 



10°-1C 3-76 c.c. 



20°-9 C 7-8 c.c. 



30° 11-32 c.c. 



40° C. 15-06 c.c. 



50°- 2 C 19-0 c.c. 



59°-8 C 22-6 c.c. 



70°-3C 26-52 c.c. 



80°'2 C 30-14 c.c. 



89°-7 C 33-86 c.c. 



100°-4C 37-74 c.c. 



Coefficient of expansion =-003760. 



o°c 



Fig. 4. — Expansion of Sulphur Dioxide. 























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80' 



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Expansion of hydrochloric acid gas. 



The gas was prepared by means of an aqueous solution of 

 hydrochloric acid and strong sulphuric acid. It was dried 



