DEFINITIONS 



Definition for Milk. — Normal milk is a liquid secreted by all healthy 

 females of the mammalian group, for feeding their offspring. 



Definition for Specific Gravity. — The specific gravity of a substance is the 

 relation between the weight of that substance and the weight of an equal vol- 

 ume of distilled water. Water is always considered as one, or the unit, with 

 which liquids and solids of the same temperature are compared. Examples: 



1 gallon of water weighs 8.3 lbs. Specific Gravity 1. 

 1 gallon of milk weighs 8.6 lbs. 1.032 



1 gallon of butterfat weighs 7.7 lbs. " " .93 



Definition of Centrifugal Force. — Centrifugal force is the outward pull or 

 pressure brought on a wheel or object when rotating and being whirled from 

 the centre. The centrifugal force is increased (a) directly in proportion to 

 the decrease in the diameter (the velocity remaining the same), and (b) 

 directly with the square of the velocity (diameter being constant). 



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