Abbreviations

The abbreviations used in this article have the following meanings: A - ampere A.S.T.M. - American Society for Testing and Materials Btu - British thermal unit °C - degree Celsius (centigrade) cal - calorie CdS - cadmium sulfide cfm - cubic feet per minute CFR - Code of Federal Regulations cu ft - cubic feet CO - carbon monoxide CO2 - carbon dioxide dcf - dry cubic feet dcm - dry cubic meter dscf - dry cubic feet at standard conditions dscm - dry cubic meter at standard conditions eq - equivalents °F - degree Fahrenheit ft - feet g - gram gal - gallon g eq - gram equivalents gr - grain hr - hour HCl - hydrochloric acid Hg - mercury H2O - water H2S - hydrogen sulfide H2SO4 - sulfuric acid Hz - hertz in. - inch j - joule °K - degree Kelvin k - 1,000 kg - kilogram l - liter lpm - liter per minute lb - pound m - meter m3 - cubic meter meq - milliequivalent min - minute mg - milligram - 10-3 gram Mg - megagram - 106 gram ml - milliliter - 10-3 liter mm - millimeter - 10-3 meter mol - mole mol.wt. - molecular weight mV - millivolt N2 - nitrogen N - newton ng - nanogram - 10-9 gram nm - nanometer - 10-9 meter NO - nitric oxide NO2 - nitrogen dioxide NOx - nitrogen oxides O2 - oxygen Pa - pascal PM - particulate matter PM2.5 - particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers PM10 - particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers ppb - parts per billion ppm - parts per million psia - pounds per square inch absolute psig - pounds per square inch gauge °R - degree Rankine s-sec - second scf - cubic feet at standard conditions scfh - cubic feet per hour at standard conditions scm - cubic meters at standard conditions scmh - cubic meters per hour at standard conditions SO2 - sulfur dioxide SO3 - sulfur trioxide SOx - sulfur oxides sq ft - square feet std - at standard conditions TSP - total suspended particulate μg - microgram - 10-6 gram V - volt W - watt Ω - ohm