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backpressure

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back⋅pres⋅sure

[bak-presh-er]
–noun
a resistant pressure exerted by liquid or gas against the forward motion or flow of an exhaust or pipe system: Careful control of backpressure ensures an even supply of oil from the well.
Also, back pressure.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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back·pres·sure   (bāk'prěsh'ər)   
n.  Residual pressure opposing the free flow of a gas or liquid, as in a pipe or an exhaust system.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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