Homogeneity and heterogeneity are concepts relating to the uniformity or lack thereof in a substance. A material that is homogeneous is uniform in composition or character; one that is heterogeneous lacks uniformity in one of these qualities.The concepts are applicable to combinations at every level of complexity, from atoms to populations of animals or people, to galaxies. Hence, a substance may be homogeneous on a larger scale, compared to being heterogeneous on a smaller scale within the same substance (1) ]"In 1899 Auguste Gaulin obtained a patent on his homogenizer. The patent consisted of a 3 piston pump in which product was forced through one or more hair like tubes under pressure. At the World’s Fair in Paris in 1900, Auguste Gaulin exhibited his invention… a process for “treating” milk. According to the literature and publications of that time, the word “”homogenized” was first used to describe milk treated by the Gaulin machine. Therefore, the terms “homogenization” and “homogenizer” historically relate to the process and equipment developed by Gaulin. The homogenizer basically consists of a positivedisplacement pump to which is attached a homogenizing valve assembly. The pump forces fluids through the homogenizing valve under pressure. The term “homogenization” refers to the process or action that occurs within the homogenizing valve assembly.(4)