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TeachMeFinance.com - explain Criticality Criticality The term 'Criticality' as it applies to the area of nuclear science can be defined as ' The normal operating condition of a reactor, in which nuclear fuel sustains a fission chain reaction. A reactor achieves criticality (and is said to be critical) when each fission event releases a sufficient number of neutrons to sustain an ongoing series of reactions. '. Previous 5 Terms: Critical mass Critical organ Critical Rainfall Probability Critical slope Critical velocity Next 5 Terms: CRN croceate Crochet crook Crop acreage base About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.