foam definitions

 Law of heat flow Heat tends to flow from a hot substance to a cold substance 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 Convection Is the transfer of heat by the movement of heated air or liquid Radiation Is the transmission of energy as an electromagnetic wave w/o an intervening medium Heat waves (Sometimes called infrared rays) are longer than light waves Direct flame contact other term Impingement other term Direct flame contact (impingement) is a combination of convection and radiation at ______. combination of convection and radiation at close range Other word for pyrolysis Other word for sublimation Pyrolysis (sublimation) The chemical decomposition of a substance through the action of heat. Flash point Minimum temp at which a liquid releases enough vapors to form an igniteable mixture Volatility Ease with which a liquid releases vapors Vapor pressure A measure of the pressure that is exerted by the LIQUID on the atmosphere it is in contact with Ambient temp 70*F - 21*C Fire point The temp at which a fuel produces sufficiant vapors to support combustion Fire point AKA Burning point AKA Flammable liquids Release enough vapors to support combustion at temp less than 100° Combustable liquids Liquids that must be at temp greater than 100° to release flamable liquids Radiative feedback Radiant heat providing energy for continued vapor production. Other term for growth stage Other term for Incipient phase or ignition Ignition phase Period when the four elements of the fire tetrahedron come together and flamming combustion begins. Heat release rate The amount of heat energy released in a fire Miscible Dissolve in water Immiscible Do not mix with water 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 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 Referred to as Smart foams AR-AFFF 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 AuthorJbrand ID91399 Card Setfoam definitions Descriptionfoam definitions Updated2011-06-21T00:13:54Z Show Answers