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Symposium: Dynamic State of Milk

Physical Changes

Department of Dairy and Food Science, Cornell University, Ithaca, New York

ABSTRACT

I am going to discuss the changing properties of three systems: milk, skimmilk, and cream. One can measure the properties of some materials and record the values for future use with confidence that they will not change. That is not true of milk. No two lots of milk are exactly alike, and two portions from the same lot may have different properties. Milk is changeable and unpredictable.

I will limit myself to the physical properties of milk, skimmilk, and cream, which are unstable. Let me explain what I mean by an unstable property. The weight of a sample of milk is a stable property. It does not change in any manner. It does not change with time. It does not change with the history of the sample, or in some irregular way with changes in temperature.

Some physical properties of milk do change in an irregular way with change in temperature, some change with time at constant temperature, and some depend upon the previous history of the sample.