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TeachMeFinance.com - explain Boundary Layer Boundary Layer The term 'Boundary Layer' as it applies to the area of the weather can be defined as ' In general, a layer of air adjacent to a bounding surface. Specifically, the term most often refers to the planetary boundary layer, which is the layer within which the effects of friction are significant. For the earth, this layer is considered to be roughly the lowest one or two kilometers of the atmosphere. It is within this layer that temperatures are most strongly affected by daytime insolation and nighttime radiational cooling, and winds are affected by friction with the earth's surface. The effects of friction die out gradually with increasing height, so the 'top' of this layer cannot be defined exactly'. Previous 5 Terms: Bottom-hole contribution Bottoming cycle boulder Boulder clay Bound tariff rate Next 5 Terms: Bounded Weak Echo Region (BWER) BOVC boviform bovine Bovine somatotropin (bST) 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.