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Flammable and Combustible Liquids - h1015v2_125
Safety Precautions - h1015v2_127

Chemistry Volume 2 of 2
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DOE-HDBK-1015/2-93 FLAMMABLE AND COMBUSTIBLE LIQUIDS Hazards of Chemicals and Gases CH-05 Rev. 0 Page 32 Figure 4  DOT Flammable Liquid Labels Volatility - The tendency or ability of a liquid to vaporize. Oxygen Limits - The concentration of oxygen below which a normally flammable vapor mixture will not  ignite  (normally  12  to  14  percent  oxygen).    An  increase  of  pressure  or temperature will reduce the required lower oxygen limit, however. Rate of Diffusion - The  tendency  of one gas or vapor to disperse into or mix with another gas or vapor. Dependent upon the density of the vapor or gas as compared to air. Vapor Pressure - The pressure exerted by a volatile liquid under any of the conditions of equilibrium that may exist between the vapors and the liquid. Oxygen Deficiency - The  designation given to an atmosphere containing less than the percentage of oxygen normally found in air (<21%). The  volatility of liquids will increase as heat is applied to them.  Accordingly, combustible liquids should be treated as flammable when they are heated even though the liquid, when not heated, is outside the flammable range. The Department of Transportation (DOT) has modified the definition of flammable liquids in its Hazardous Materials Regulation, 49 CFR parts 170 to 179.  They are defined as any liquid that gives off flammable vapors at or below a temperature of 80   F.  This definition is  important because  the  DOT  Flammable  Liquid  Label,  illustrated  in  Figure  4,  is  one  means  by  which containers of flammable liquids can be identified for shipping, receiving, and transportation.







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