ON MILK AND MILK-TESTING 23 



I quart water weighs 946.4 grams. 

 I quart milk weighs 946.4X1.032 grams. 

 453-6 gTams=i pound. 

 976.6848 grams=2.i53 pounds. 

 I quart milk weighs 2.153 pounds. 

 40 quarts milk weigh 2.53X40 pounds=86.i2 

 pounds. 



How does the weight of 40 quarts milk compare 

 with the weight of 40 quarts water? 



I quart milk weighs 2.153 pounds. 



I quart water weighs 2.086 pounds. 



40 quarts milk weigh 86.12 pounds. 



40 quarts water weigh 83.44 pounds. 



The weight of milk is 1.032 times as great as the 

 same volume water. 



What substances make up the milk serum? 



Water 87.0% 



Casein and albumin. . 3.4% 



Milk sugar 5-0% 



Mineral matter 7% 



What is the specific gravity of melted milk fat? 



Between the temperatures of 120° F. and 160° F. 

 the specific gravity is .9; that is, when a definite 

 volume of water weighs 1,000 the same volume of 

 milk fat weighs 900. 



What common proof have we that the specific 

 gravity of milk fat and milk serum differs? 

 When milk remains quiet for a time, the globules 

 of fat rise to the surface in the form of cream. 



