Chap. I] EXPLANATIONS AND DEFINITIONS 13 



are liberated, or suflBcient heat energy to raise 943 grams of water 

 through 100 degrees. 



When 25 grams of sugar are oxidized, 100 calories of heat energy 

 are produced ; therefore, if the sugar is used as a food, the energy 

 produced by the same can be expected to be proportionate to this 

 estimate. 



Large calorie. — ^The large calorie (cal.) is the amount of 

 heat that is necessary to raise 1000 grams of water through one 

 degree centigrade. This shows the large calorie to be equal to 

 1000 small calories. (See page 311.) 



