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  • Vacuum

    Space completely devoid of matter or pressure. In fire service terms, it is more commonly used to describe a pressure that is somewhat less than atmospheric pressure. Needed to facilitate drafting of water from a static source.

  • vagal activity

    Parasympathetic activity.

  • vagina

    The genital canal in the female extending from the uterus to the vulva; the birth canal.

  • vagus

    The tenth cranial nerve, chief mediator of the parasympa thetic nervous system.

  • vallecula

    The groove between the base of the tongue and the epiglottis.

  • Valsalva maneuver

    A forced exhalation against a closed glottis, the effect of which is to stimulate the vagus nerve and thereby slow the heart rate.

  • Valve

    Mechanical device with a passageway that controls the flow of a liquid or gas.

  • Valve

    mechanical means for stopping and starting flow in a conduit

  • Vapor

    Gaseous form of a substance that is normally in a solid or liquid state at room temperature and pressure; formed by evaporation from a liquid or sublimation from a solid

  • Vapor

    Gaseous form of a substance that is normally in a solid or liquid state at room temperature and pressure; formed by evaporation from a liquid or sublimation from a solid

  • Vapor Density

    Weight of a given volume of pure vapor or gas compared to the weight of an equal volume of dry air at the same temperature and pressure

  • Vapor Density

    Weight of a given volume of pure vapor or gas compared to the weight of an equal volume of dry air at the same temperature and pressure

  • Vapor Pressure

    Measure of the tendency of a substance to evaporate

  • Vapor Pressure

    Measure of the tendency of a substance to evaporate

  • Vapor pressure (equilibrium vapor pressure)

    The pressure of a vapor in thermodynamic equilibrium with its condensed phases in a closed system.

  • Vapor suppression

    Process of reducing the amount of flammable or other hazardous vapors, from a flammable liquid, mixing with air, typically by careful application of a foam blanket on top of a pool of material.

  • Vaporization

    Passage from a liquid to a gaseous state

  • Vaporization

    Passage from a liquid to a gaseous state

  • variant angina

    See Prinzmetal’s angina.

  • vasoconstriction

    Narrowing of the diameter of a blood vessel.

  • vasoconstrictor

    A substance that causes narrowing of the diameter of blood vessels; an alpha sympathetic agent.

  • vasodilation

    Widening of the diameter of blood vessels.

  • vasodilator

    A substance that causes widening of the diameter of blood vessels.

  • vasopressor

    An agent that raises the blood pressure by causing vasoconstriction.

  • vasovagal

    Having vascular and vagal components; often used to refer to a syndrome consisting of precordial distress, anxiety, nausea, and sometimes syncope.

  • VD

    An abbreviation for venereal disease.

  • Vehicle fire

    Type of fire involving motor vehicles themselves, their fuel or cargo; has peculiar issues of rescue, explosion sources, toxic smoke and runoff, and scene safety.

  • vein

    A blood vessel that carries blood to the heart.

  • Velocity

    Speed; the rate of motion in a given direction. It is measured in feet per second, miles per hour, etc.

  • venae cavae

    The largest veins of the body, which return blood to the right atrium.

  • Veneer Walls

    Walls with a surface layer of attractive material laid over a base of common material.

  • venipuncture

    The puncture of a vein to obtain a blood sample or to introduce a catheter.

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