CALCULATION OF THE VOLUME FROM ANALYSIS. 137 



The weight of carbonic oxide of volume v' is 1.2512;', and 

 as 28 of carbonic oxide contains 12 of carbon, the ratio be- 

 comes 28:12 = 7:3. We then have 



v X 1.251 X 3 , , 

 = 0.5362;'. 



The weight of a volume of carbon vapor is v" X 1.072. 



To calculate the weight of carbon in a cubic metre of gas. 

 multiply the added volumes of CO 2 and CO by the coefficient 

 0.536. Multiply the volume of carbon vapor by 1.072, and 

 add this product to that obtained above. The sum is the 

 weight of carbon per cubic metre, 



C = 0.536(2; + V 1 ) + 1.072V". 



If the gas contains, per cubic metre, 60 litres of carbonic 

 acid, 10 of carbonic oxide, and I of carbon vapor, we will 

 have 



c 0.536(60 + 10) + 1.072 X i 38.592 grams carbon. 



From the ratio of carbon of the coal consumed and that in 

 the gas the volume of combustion gases is deduced. 



To calculate this, subtract the carbon of the cinders from 

 that of the original coal. If the coal contains 81 percent 

 carbon and leaves 6 per cent of cinders containing 10 percent 

 of carbon, then the amount of carbon burnt will be 



8 1 (o. 10 X 6.0) = 8 1 0.6 = 80.4. 

 We then have 



38.592: 1000= 804:20.830 litres. 



A kilogram of coal produces, then, 20.83 cubic metres of gas 

 at o and 760 mm. 



The general formula is 



(v-\- 2/)o.536+ 1.0722;' 



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