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  • BA

    Royal Navy abbreviation for Breathing Apparatus. Otherwise known as SCBFR

  • BA Set

    Breathing Apparatus Set consisting of a face-mask and compressed air cylinder

  • Babinski reflex

    A reflex response of the big toe seen in patients with injury to the brain. When the sole of the foot is stroked with a semi-sharp object, the big toe turns upward, instead of in the normal downward direction.

  • Back burning

    Australian term, for Backfiring, above.

  • Back Flushing

    The cleaning of a fire pump or piping by flowing water through it in the opposite direction of normal flow.

  • Backburn

    Precautionary fire set downwind of main fire for controlled fuel clearing by "backing" it into the main fire, similar to burnout, below, which occurs adjacent to control line.

  • Backdraft

    Instantaneous explosion or rapid burning of superheated gases that occurs when oxygen is introduced into a smoldering (oxygen-depleted) fire in a confined space; stalled combustion resumes with explosive force.

  • Backdraft

    A fire phenomenon caused when heat and heavy smoke (unburned fuel particles) accumulate inside a compartment, depleting the available air, and then oxygen/air is re-introduced, completing the fire triangle and causing rapid combustion.

  • Backdraft

    Instantaneous explosion or rapid burning of superheated gases that occurs when oxygen is introduced into a smoldering (oxygen-depleted) fire in a confined space; stalled combustion resumes with explosive force.

  • Backfire

    A fire set along the inner edge of a fireline to consume the fuel in the path of a wildfire and/or change the direction or force of the fire?s convection column.

  • Backfiring

    Also known as a "controlled burn," it’s a tactic mostly used in wildland firefighting associated with indirect attack, by intentionally setting fire to fuels inside the control line. Most often used to contain a rapidly spreading fire, placing control lines Read on! →

  • Backflow preventer

    Automatic valve used in hose accessories to ensure water flows only in one direction. Used in permanent fire department connections (FDC) to sprinklers and dry standpipes, as well as portable devices used in firefighting.

  • Backstretching

    Doing a fire to hydrant procedure.

  • Baffle

    Intermediate partial bulkhead that reduces the surge effect in a partially loaded liquid tank.

  • Bag Valve Mask (BVM)

    A bag valve mask, abbreviated to BVM and sometimes known by the proprietary name Ambu bag, is a hand-held device used to provide positive pressure ventilation to a patient who is not breathing or who is breathing inadequately. The device Read on! →

  • Bail-out

    The act of completing a quick egress away from a fire room, on a ladder. This is done if flashover conditional are imminent.

  • Balanced Pressure Proportioner

    A foam concentrate proportioner that operates in tandem with a fire water pump to ensure a proper foam concentrate-to-water mixture.

  • Ball Valve

    Valve having a ball-shaped internal component with a hole through its center that permits water to flow through when aligned with the waterway.

  • ball-and-socket joint

    A type of joint found in the hip and shoulder.

  • Balloon Frame

    A type of wood-frame construction in which the studs in exterior walls extend from the basement or foundation to the roof. This type of construction allows fires to spread undetected from the basement to the attic through the hollow walls.

  • Bambi bucket

    collapsible bucket for lifting and moving water or other fire retardant with a helicopter. (Note: The name was in use many years before the trademark owner claimed it in 1983.)

  • bandage

    A material used to hold a dressing in place.

  • Bank down

    What the smoke does as it fills a room, banks down to the floor, creating several layers of heat and smoke at different temperatures?the coolest at the bottom.

  • Bar Joist

    A joist constructed of steel with bars in the vertical web space. A Common structural component in office buildings and other commercial structures. Very high strength to weight ratio except when exposed to heat, in which early failure is likely.

  • barbiturate

    A class of drugs that produce a calming, sedative effect. This class does not relieve pain and can sometimes magnify existing pain.

  • Barrier

    Any obstruction to the spread of fire. Typically an area or strip devoid of combustible fuel.

  • Base

    Corrosive water-soluble compound or substance containing group-forming hydroxide ions in water solution that reacts with an acid to form a salt; an alkaline (caustic) substance

  • Base

    (1) staging and/or command center location for fire operations

  • Base

    Corrosive water-soluble compound or substance containing group-forming hydroxide ions in water solution that reacts with an acid to form a salt; an alkaline (caustic) substance

  • Base

    A compound that dissociates to form more hydroxyl ions (OH-) than hydrogen ions (H+); a solution having a pH greater than 7.0

  • basic life support

    The ABC’s without adjunctive equipment.

  • Battle’s sign

    A bluish discoloration over the tip of the mastoid bone behind the ear, signifying basilar skull fracture.

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