In 1923, 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.
Pada tahun 1923, William H. Walker, Warren K. Lewis dan William H. McAdams menulis buku The Principles of Chemical Engineering menjelaskan bahwa berbagai industri kimia mengikuti hukum-hukum fisika yang sama.