Fumed oxides, definition

Place (he bottle with contents in a chamber maintained at 65.5°il°C (See Fig oa p 28 of Ref 12 and on p 49 of Ref 13), the air in which is preferably maintained in constant circulation After (he bottle with contents has been heated for 24 hrs, reseat (he stopper. Make daily observation of the appearance of the sample and note the number of days required to cause (he liberation of visible reddish or brownish fumes of oxides of nitrogen Note It has been customary to consider any proplnt having a test value of 90 days or less to be of definitely impaired stability and any proplnt having a test value of 20 days or less to be sufficiently unstable as to require destruction or salvage... 

SAFETY PROFILE A very dangerous fire and explosion hazard when exposed to heat, flame, shock, or oxidizers. It is a powerful high explosive. Nitrostarch is not a definite compound, but a mixture of various nitric acid esters of starch with different degrees of nitration. When heated to decomposition it emits toxic fumes of NOx. See also NITRO COMPOUNDS. 

The many words employed to describe particulate systems attest to their ubiquity and to ilie impression they have made on humans from early times. Smoke, dust, haze, fume, mist, and soot are all terms in common use with somewhat different popular meanings. Thus dust usually refers to solid particles produced by disintegration processes, while smoke i nd fume particles are generally smaller and formed from the gas phase. Af/.vr.v are composed of liquid droplets. Soot usually refers to small carbon particles generated in fuel combu.stton but is now frequently used to describe very fine solid particles of silica and other inorganic oxides generated intentionally in industrial processes. In this text, however, we will rarely employ these special terms because of the difficulty of exact definition and the complexity of many real systems composed of mixtures of particles. Instead, we employ the generic term aeiosol to describe all such sy.siems of small particles suspended in air or another gas. 

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