1232 PHYSIOLOGY 



to give the data as to carbon dioxide production and the amount of 

 air required in cubic feet. 



An adult man gives off about 0-6 cubic foot of C0 2 every hour. 

 Hence in that time he raises the amount of C0 2 in 1000 cubic feet of 

 air from -04 per cent, (the, normal amount in the atmosphere) to 

 0-1 per cent. He must therefore be supplied with 2000 cubic feet of 

 air per hour in order to keep the amount of C0 2 down to -07 per cent. 



(Ordinary air contains '04 per cent. C0 2 , therefore 2000 cubic feet 

 would contain 0*8 cubic foot C0 2 , which with the 0-6 cubic foot given 

 off by the man would be 1-4, which is -07 per cent.) 



In order that the air may be easily renewed without giving rise 

 to excessive draught, a certain amount of cubic space must be allotted 

 to each man. Each adult should have in a room 1000 cubic feet of 

 space, and be supplied every hour with 2000 to 3000 cubic feet of air. 



