Different foodstuffs on burning give different amounts of energy. How much heat will be obtained by burning a particular foodstuff is expressed by the term caloric value. Caloric value is defined as amount of heat-energy obtained by burning 1.0 gm of the food stuff completely in the presence of O2. Caloric value of different foodstuffs is determined in vitro in a special apparatus called bomb calorimeter
Principle and Procedure
1. A weighed amount of the sample is burnt in an atmosphere of O2 by an electrically heated platinum wire.2. The heat evolved is absorbed in a weighed amount of water which surrounds the burning chamber.3. The rise of temperature is recorded with the help of a sensitive thermometer.
Calculation: From the above data, heat evolved by 1.0 gm of food can be calculated with the following formula:
H = (W (T2 – T1)/M (1000)) *Kcal/gm Where,W = Water equivalent of calorimeter and its water.T2–T1 = Rise in temperature in centigrade.M = Denotes amount of food burnt in gm. The unit of energy is calorie (c).
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