Definition of substitution. 1  1a : the act, process, or result of substituting one thing for anotherb : replacement of one mathematical entity by another of equal value. 2  2 : one that is substituted for another.
Homogenized milk is any sort of milk that has been mechanically treated to ensure that it has a smooth, even consistency. The homogenization process typically involves high temperatures, agitation, and filtration, all aimed at breaking down milk's naturally occurring fat molecules.
âIn 1929 he researched and developed a homogenization process for milk. He discovered that for homogenized milk to taste good it must be pasteurized first. He wrote a book called Homogenized Milk which became a respected book on the subject.â Biographical Note, âBiographical Papers of Malcolm C. Trout,â UA.17.127, Michigan State University Archives & Historical Collections, East Lansing, Michigan.