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THE ROYAL SOCIETY OF CANADA 



and the stopper instantly inserted in the bottle. The gas liberated 

 is .collected as above. In one experiment the following readings were 

 taken : 



Temperature of liquid — 158°C. 



Mass of copper rod 8-92 gm. 



Temperature of copper before insertion 17-5°C, 



Volume of gas liberated 1500 cc. 



Density of methane at time of experiment = -00070 gm. per cc. 



If s = average specific heat of copper from 173^°C. down to 

 -158°C. then 8-92XsX(173^+158) = 1500X •00070XL. 



To get s, the copper rod was quickly removed from the liquid 

 methane and immersed in a weighed quantity of water in a copper 

 calorimeter. From the resulting temperatures, s can be calculated. 

 The value of s was found to be about -087 calories per gm. per degree. 



8-92X-087X175 



Hence L = = 130 calories per gm. 



1500 X -00070 



The specific gravity of the liquid methane in this case was meas- 

 ured by a U-tube arrangement such as is used on liquefaction machines 

 and found to be -41. The figure given in the Smithsonian tables is 

 •416, thus our liquid was fairly pure. 



The average of the three results is 138 calories per gm. which 

 should not be more than 5% out. 



The latent heat of liquid ethane (temperature = — 90°C. by a 

 pentane thermometer) was determined by the copper rod. When the 



