Century Dictionary and Cyclopedia
- n. Pressure backward or in the reverse of the normal direction; specifically, the resistance of the atmosphere or of waste steam to the action of the piston of a steam-engine.
GNU Webster's 1913
- adj. (Steam Engine) See under Pressure.
- n. (Steam engine) pressure which resists the motion of the piston, as the pressure of exhaust steam which does not find free outlet.
“Eventually the investigators determined that a frozen regulator, a faulty relief valve, and a rapid buildup of back pressure caused the center structure of the X-15’s ammonia tank to ram and smash open the control system’s hydrogen peroxide sphere.”
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