As many as 40 years ago,P.V.Danckwerts already recognized that,"It will be a great mistake to think of the content of chemical engineering science as permanently fixed.It is likely to alter greatly over the years in response to the changing requirements of industry and to new scientific discoveries and ideas for their application." This statement clearly draws the bipolar nature of chemical engineering:Just like any other field of engineering,chemical engineering has to face a permanent dilemma.
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