Back Pressure

back pressure [′bak ‚presh·ər]

(mechanics)

Pressure due to a force that is operating in a direction opposite to that being considered, such as that of a fluid flow.

(mechanical engineering)

Resistance transferred from rock into the drill stem when the bit is being fed at a faster rate than the bit can cut.

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back pressure

Pressure developed in opposition to the flow of liquid or gas in a pipe, duct, conduit, etc.; due to friction, gravity, or some other restriction to flow of the conveyed fluid.

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Back Pressure 

the pressure of steam or gas at the end of the expansion process in a heat engine, such as a steam or gas turbine or a steam engine. The term “back pressure” is used to define the final pressure that exists when the expansion does not terminate in the condensation of the steam. In a steam turbine with back pressure, the exhaust steam is not condensed and, instead, is used as a source of heat for either an industrial process or another turbine.