Document YDy8XY76djd76K6oLwBd1N5KK

HEATING VENTILATING AIR CONDITIONING COIDE 1941 Although it is possible under certain conditions to recognize the presence of particles smaller than 10 microns, the normal eye is unable to resolve any dimension under about 50 microns, and thus all air floated material of this kind is too small to identify without the aid of a micro scope. Mineral particles, such as grains of sand, bits of rock, volcanic ash, or fly-ash, can be transported long distances under unusual circumstances. Thus, the dust storms of 1935 in the Kansas district resulted in vast amounts of fine top soil being thrown high into the air. Solar illumination 526 fe CHAPTER 27. AIR POLLUTION Table 1. Approximate Limits of Inflammability of Single Gases and Vapors in Air at Ordinary Temperatures and Pressures* Gas os Vapob VoluLmoeweosr PLeobotCbnt Highsb Loot1 Volume xn Peb Cent Hydrogen.............. ............................................ Ammonia..... .................................................... Hydrogen sulphide........ ............... .................. Carbon disulphide.......................................... Carbon monoxide............................................. Methane----...------------- -................................. Methane (turbulent mixture).......................... Ethane................................ ....................... -..... Propane.--............................... -...................... Butane.......... ................................................... Pentane....... ..................................................... Ethylene--........................................................ Acetylene (turbulent mixture)...................... . Benzene. _ --.................................................... Toluene....................... ...... ................................ Cyclohexane...................................................... Methyl cyclohexane.......................................... Ethyl alcohol--.............................. ................Ethyl ether._ ................................................--. Gasoline................... ................................... ..... Water gas--.... -.............. ...................... ........... Ethylene oxide. ............................ ................... Acetaldehyde................................................... Furfural (125 C)...... .... ................................... Acetone__ -- Acetone (turbulent mixture)............................ Methyl ethyl ketone............. ............................ Methyl formate........... ............--.................... Ethyl formate................. .............................. . Methyl acetate. _~........................ ....... Ethyl acetate-- . ...... ......................... ........... Ethyl nitrite....... ............ ...... ................... Methyl chloride............................................ -- Methyl bromide............. .... ........................... Ethyl chloride..... ................ ..... .................... Ethyl bromide......... .................................. Ethylene dichloride... ......... .................-......... Dichlorethylene......... ............................... ... Vinyl chloride. .................... ..................... Pyridine (70 C)................................................. Natural gas._____ ___________________ ___-- Illuminating gas....... ..................................... Blast-furnace gas._______ _________________ 4.1 16.0 4.3 1.0 12.5 5.3 5.0 3.2 2.4 1.9 1.45 3.0 3.0 2.3 1.4 1.4 1.3 1.2 7.0 4.0 1.7 1.1 1.4 6 to 9 3.0 4.0 2.0 3.0 2.5 2.0 6.0 3.5 4.1 2.5 2.0 1.7 3.0 8.0 13.5 4.0 7.0 6.0 10.0 4.0 1.8 4.8 5.3 35.0 74.0 27.0 46.0 50.0 74.0 14.0 15.0 12.5 9.5 8.5 7.5 29.0 __ _ 7.0 7.0 8.3 ___ 19.0 26.0 6.0 55 to 70 80.0 57.0 11.0 ___ 12.0 20.0 16.5 14.0 ` 11.5 19.6 14.5 15.0 11.0 16.0' 13.0 22.0 12.5 13.5 31.0 74.0 Limits of Inflammability of Gases and Vapors, by H. F. Coward and G. W. Jones. (/. 5. Bureau of Mines, Bulletin No. 279, 1931). 527