1. 
   Back Pressure
   A pressure that can cause water to backflow into the water supply when a user's waste water system is at a higher pressure than the public system.
   Found op http://www.epa.gov/OCEPAterms/
   
   
2. 
   back pressure
   the pressure resulting from restriction of full natural flow of oil or gas.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   back pressure
   Pressure exerted upstream in the circulation as a result of obstruction to forward flow, as when congestion in the pulmonary circulation results from stenosis of the mitral valve or failure of the left ventricle. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?back+pressure
   
   
4. 
   Back pressure
   Back pressure refers to the resistance to a moving fluid by obstructions or tight bends in the confinement vessel along which it is moving, such as piping or air vents, against its direction of flow. Because it is really resistance, the term back pressure is misleading as the pressure remains and c...
   Found op http://en.wikipedia.org/wiki/Back_pressure
   
   
5. 
   Back Pressure
   The applied hydraulic pressure used to restrict the shot size formation. Applied to the back of a melt accumulator or reciprocating screw. Used to control screw drift, mixing, and shot size adjustments. In molding, back pressure increases the temperature of the melt, and contributes to better mixing...
   Found op http://www.blowmachines.com/glossary1.htm
   
   
6. 
   back pressure
   Type: Term Definitions: 1. pressure exerted upstream in the circulation as a result of obstruction to forward flow, as when congestion in the pulmonary circulation results from stenosis of the mitral valve or failure of the left ventricle.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=71964
   
   
7. 
   back-pressure
   1. the pressure maintained on equipment or systems through which a fluid flows. 2. in reference to engines, a term used to describe the resistance to the flow of exhaust gas through the exhaust pipe. 3. the operating pressure level measured downstream from a measuring device.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   

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