foam definitions

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foam definitions
2011-06-20 20:13:54
foam definitions

foam definitions
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  1. Law of heat flow
    Heat tends to flow from a hot substance to a cold substance
  2. Conduction
    Is the transfer of heat from one body to another by direct contact of the two bodies or by an intervening heat-conducting medium
  3. Convection
    Is the transfer of heat by the movement of heated air or liquid
  4. Radiation
    Is the transmission of energy as an electromagnetic wave w/o an intervening medium
  5. Heat waves
    (Sometimes called infrared rays) are longer than light waves
  6. Direct flame contact other term
    Impingement other term
  7. Direct flame contact (impingement) is a combination of convection and radiation at ______.
    combination of convection and radiation at close range
  8. Other word for pyrolysis
    Other word for sublimation
  9. Pyrolysis (sublimation)
    The chemical decomposition of a substance through the action of heat.
  10. Flash point
    Minimum temp at which a liquid releases enough vapors to form an igniteable mixture
  11. Volatility
    Ease with which a liquid releases vapors
  12. Vapor pressure
    A measure of the pressure that is exerted by the LIQUID on the atmosphere it is in contact with
  13. Ambient temp
    70*F - 21*C
  14. Fire point
    The temp at which a fuel produces sufficiant vapors to support combustion
  15. Fire point AKA
    Burning point AKA
  16. Flammable liquids
    Release enough vapors to support combustion at temp less than 100°
  17. Combustable liquids
    Liquids that must be at temp greater than 100° to release flamable liquids
  18. Radiative feedback
    Radiant heat providing energy for continued vapor production.
  19. Other term for growth stage
    Other term for Incipient phase or ignition
  20. Ignition phase
    Period when the four elements of the fire tetrahedron come together and flamming combustion begins.
  21. Heat release rate
    The amount of heat energy released in a fire
  22. Miscible
    Dissolve in water
  23. Immiscible
    Do not mix with water
  24. Surface tension reduction-
    The effect of a surfacant on the solution allows water to spread more rapidly over the surface of class A fuels and penatrate organic fuels
  25. Expansion ratio
    Aeration of the solution into a volume of bubbles that is greater than the volume of the solutionand is expressed in air/solution
  26. Referred to as Smart foams
  27. AR-AFFF are often referred to as ___ because they tend to ___ when they detect polar or hydrocarbon fuels
    • 1. Smart foams
    • 2. Adjust there chemistry