The chemistry of plant and animal life . F. The caloricvalue of a food is determined by means of the calorimeter(Fig. 94). The calorimeter consists of a steel bombthat is placed in a metal cylinder (Q) (Fig. 95). Thebomb is surrounded by water as indicated in the illus-tration, and the cylinder containing the bomb and wateris placed within a double-walled fiber receptacle (Tand U). The bomb itself consists of three parts : The 328 AGRICULTURAL CHEMISTRY cylinder, which is lined with platinum, the cover, and a collar to hold thecover in placeand tightly sealthe bomb. Thesethree parts ofthe appa
The chemistry of plant and animal life . F. The caloricvalue of a food is determined by means of the calorimeter(Fig. 94). The calorimeter consists of a steel bombthat is placed in a metal cylinder (Q) (Fig. 95). Thebomb is surrounded by water as indicated in the illus-tration, and the cylinder containing the bomb and wateris placed within a double-walled fiber receptacle (Tand U). The bomb itself consists of three parts : The 328 AGRICULTURAL CHEMISTRY cylinder, which is lined with platinum, the cover, and a collar to hold thecover in placeand tightly sealthe bomb. Thesethree parts ofthe apparatusare shown inFig. 96. The principleinvolved in de-termining thecaloric value ofa food is weighedamount of thesubstance isburned in thecalorimeter andthe rise in tem-perature of thewater that sur-rounds the bombis noted. Thecombustion i scarried on inoxygen so as tobe complete, and all means possible are employed tosecure accuracy of results. The substance to be burned,if it is a material like flour, is made into a pellet by. Fig. 94.—Bomb calorimeter used for determiningthe caloric or heat-producing value of foods.
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