Editing Unit operation (section)

==History==
Historically, the different chemical industries were regarded as different industrial processes and with different principles. [[Arthur Dehon Little]] developed the concept of "unit operations" to explain industrial chemistry processes in 1916.<ref>{{cite web|title=Arther Dehon Little|work=Scatter Acorns That Oaks May Grow|url=https://archivesspace.mit.edu/repositories/2/archival_objects/254577|publisher=MIT ArchivesSpace|access-date=2023-11-17|language=en}}</ref> In 1923, [[William Hultz Walker|William H. Walker]], [[Warren K. Lewis]] and [[William H. McAdams]] wrote the book ''The Principles of Chemical Engineering'' and explained that the variety of chemical industries have processes which follow the same physical laws.<ref name="Profile">{{cite web|title=Arthur D. Little, William H. Walker, and Warren K. Lewis|url=https://www.sciencehistory.org/historical-profile/arthur-d-little-william-h-walker-and-warren-k-lewis|website=[[Science History Institute]]|access-date=20 March 2018|language=en}}</ref> They summed up these similar processes into unit operations. Each unit operation follows the same physical laws and may be used in all relevant chemical industries. For instance, the same engineering is required to design a mixer for either napalm or porridge, even if the use, market or manufacturers are very different. The unit operations form the fundamental principles of chemical engineering.