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  • habituation

    A situation in which the effects produced by a drug are necessary to maintain a person’s feeling of well-being.

  • Halligan tool (or "Hooligan")

    Prying tool with a claw at one end and a spike or point at a right angle to a wedge at the other end. It is used in combination with maul or flat-headed axe for forcing padlocks, doors and windows.[3] Read on! →

  • hallucination

    A sense perception not founded on objective reality.

  • hallucinogen

    An agent or drug that has the capacity to stimulate hallucinations.

  • Halogenated Agent

    Chemical compount (halogenated hydrocarbon) that contains carbon plus one or more elements from the halogen series

  • Halogenated Agent

    Chemical compount (halogenated hydrocarbon) that contains carbon plus one or more elements from the halogen series

  • Halon

    chemical gas fire extinguishing or liquid agent for diminishing the combustion reaction rate by acting as a thermal ballast

  • Halyard

    Rope used on extension ladders to extend the fly sections. Also called Fly Rope.[4]

  • Hand crew

    A number of individuals that have been organized and trained and are supervised principally for operational assignments on an incident, typically using hand tools. In the United States, an ordinary hand crew is 20 in number, including supervisors.

  • Hand squirt

    A historical device used to squirt water onto a fire by hand. Also called simply a squirt or a syringe, these are perhaps the simplest and most ancient form of fire extinguisher. Known from the times of the Roman Empire Read on! →

  • Hand tub

    A type of historical fire engine where a "tub" had to be filled by a bucket brigade and then pumped onto the fire by hand. An advancement from the hand tub was to a fire engine which was still pumped Read on! →

  • Handline

    Small hoselines (2 1/2 inches or less)that can be handled and maneuvered without mechanical assistance.

  • Handtub

    A historical fire engine pumped by hand with the water supply held in a tub or cistern on the wagon, the water supply delivered by a bucket brigade. The similar terms hand pumper or hand engine may be a handtub Read on! →

  • Hard Intake Hose

    Noncollapsible hose that connects a pump to a source of water and is used for drafting.

  • Hard Line

    A smaller hose about one inch in diameter used by firefighters to clean apparatus.

  • Hard suction hose

    A flexible rubber hose reinforced with a steel core to prevent collapse from atmospheric pressure when drafting

  • Hazard

    a source of danger of personal injury or property damage; fire hazard refers to conditions that may result in fire or explosion, or may increase spread of an accidental fire, or prevent escape from fire. Under worker safety and health Read on! →

  • Hazard

    Condition, substance, or device that can directly cause injury or loss; the source of a risk

  • Hazard

    Condition, substance, or device that can directly cause injury or loss; the source of a risk

  • Hazard Class

    Group of materials designed by the U.S. Department of Transportation (DOT) that shares a major hazardous property such as radioactivity or flammability

  • Hazard Class

    Group of materials designed by the U.S. Department of Transportation (DOT) that shares a major hazardous property such as radioactivity or flammability

  • Hazard Reduction

    Precautionary controlled and managed fire lit during cooler and/or wetter weather in order to reduce the available fuel load. Sometimes incorrectly called a backburn.

  • Hazardous Material

    Any material that is explosive, flammable, poisonous, corrosive, irritating, or otherwise harmful and likely to cause injury or death; any substance that possesses and unreasonable risk to the health and safety of persons and/or the environment if it is not Read on! →

  • Hazardous Material

    Any material that is explosive, flammable, poisonous, corrosive, irritating, or otherwise harmful and likely to cause injury or death; any substance that possesses and unreasonable risk to the health and safety of persons and/or the environment if it is not Read on! →

  • HAZMAT

    Hazardous materials, including solids, liquids, or gases that may cause injury, death, or damage if released or triggered.

  • hb (hgb)

    Abbreviations for hemoglobin.

  • hct

    An abbreviation for hematocrit.

  • Head

    Water pressure due to elevation. For every 1-foot increase in elevation, 0.434 psi is gained. Also called Head Pressure.

  • Head of a fire

    The most rapidly spreading portion of a fire?s perimeter, usually to the leeward or up slope

  • Head pressure

    How the pressure of a water stream is measured. By measuring the ‘breakover’ point, the point where the water stream breaks apart and begins to fall back to the ground, of a stream of water aimed vertically into the air. Read on! →

  • Head Pressure

    Pressure exerted by a stationary column of water, directly proportional to the height of the column

  • Head Pressure

    Pressure exerted by a stationary column of water, directly proportional to the height of the column

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