
OSHA defines oxygen-enriched mixtures or atmospheres as those containing more than 23.5% oxygen by volume. In oxygen-enriched atmospheres, the reactivity of oxygen significantly increases the risk of ignition and fire. Materials that may not burn in normal air may burn vigorously in an oxygen-rich environment. Sparks normally regarded as harmless may cause fires. And materials that burn in normal air may burn with a much hotter flame and propagate at a much greater speed. For more information on fire chemistry, go to 140.194.76.129 . For more information on chemical properties and links to chemical databases, go to: www.cdc.gov This isclipped from the 1947 film The Chemistry of Fire from the US War Department. The film describes chemical processes occurring during combustion, using many interesting demonstrations: describes the vaporization of burning articles, demonstrates flash and fire points of various substances, describes how phosphorus burns, oxygen requirements for burning, the operation of an oxy-acetylene torch, and the perils of gasoline vapor, explains ignition temperatures, shows fires caused by static electricity, combustion, bomb explosions, shrapnel piercing fuel lines, and ignition of paint and bedding, describes the use of carbon dioxide, steam, and foam to extinguish fires, fires are extinguished by high-pressure streams of water, by immersion in water, and by flooding. The entire 45 minutes film is available at the US National Archives in College Park <b>...</b>
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