PLANT PRODUCTS. FERMENTATION AND FUELS 427 



5. A gas of sp. gr. 0.43 (air = 1) gives, on burning, 610 B.T.U. 

 per cu. ft. How many B.T.U. is this per pound? 



6. How many kilog. of steam, from water at 20, can be made 

 by burning 100 kilog. of coal, the heat of combustion of 1 g. of 

 which is 8500 cal.? 



7. At 5 atmos. pressure and 152 C., how many cubic meters 

 will 190 kilog. of steam occupy? 



8. What is " conservation?" What four industries or opera- 

 tions (or ways of performing operations) that are wasteful have 

 been mentioned in this chapter (compare p. 424)? 



