Document ZJkQBkrEw4yXR8Z6B1gogkrwJ

HEATINC VENTILATING AIR CONDITIONING GUIDE 1940 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. j Fig. 1. Sizes and Characteristics of Air-Borne Solids 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 78 CHAPTER 4. AIR POLLUTION Table 1. Approximate Limits of Inflammability of Single Gases and Vapors in Air at Ordinary Temperatures and Pressures3 Gas or Vapor Lower Limit Volume in Per Cent Higher Limit Volume in Per Cent Hydrogen............................................................ Ammonia............................................................. Hydrogen sulphide............................................. Carbon disulphide............ ................................. Carbon monoxide.................. _......................... Methane.......................................... ~................. Methane (turbulent mixture)............................ Ethane...........-.................................................... Propane--........................................... ..... .......... Butane.--..................................... ........... .......... Pentane..............................................-................ Ethylene........................................... -................. Acetylene........ ----------- ---------------- -----------Acetylene (turbulent mixture)..................-- ._ Benzene.................................. ......................... -- Toluene.-----Cyclohexane.----------------------............................. Ethyl alcohol----------- --------- ------------------1----- Ethyl ether............... .... ................... _.... ....... Benzine................. ........................... .................. Gasoline.- ............................................... Water gas............................................................ Ethylene oxide.. ............ ......... ......................... Acetaldehyde.... .................................................. Acetone (turbulent mixture)............... .............. Methyl ethyl ketone ...................... ........ ........ Methyl formate______ _____ ____ __________ Ethyl formate....... .. ........................... _........... Methyl acetate___ : . ..... ............ ... ..... _ Ethyl acetate..... .................... .......... .... ...... Propyl acetate Butyl acetate (30 C).......................................... Ethyl nitrite.... Methvl chloride Methyl bromide.. ............................................ Ethvl chloride Ethyl bromide Ethylene dichloride_______ __ ______ r___ ___ Dichlorethylene:____________________ ______ Vinvl 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 2_6_._0 6.0 55 to 70 80.0 57.0 11.0 12.0 20.0 16.5 14.0 11.5 19.0 .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, (U. S. Bureau of Mines, Bulletin No. 279, 1931). 79