01:119:150 Lecture Notes - Lecture 3: Sulfur Dioxide, Soot, Cool Air
30 Sep 2020
School
Department
Course
Professor
Document Summary
Much of the driving force to address air pollution comes from responses to unpleasant sensations (especially what can be seen or smelled) Air that appears clean and smells fine, may not be wholesome. Air that appears dirty and smells bad, may not be harmful. Properties of gasses: transparent, do not settle out, consist of molecules in constant motion, almost all are colorless, readily expand and contract, disperse in space, show little resistance to flow. Properties of smoke: readily visible, does settle out, consists of particles, opaque. Atmosphere - gaseous envelope that surrounds earth, mixture of gasses, water vapor, solid particles, and liquid droplets. Suspended particles (dust, soot, pollen, dust, dirt, hair, skin, etc. ) Pollutant - any substance that adversely affects air quality. *our atmosphere has gaseous (ppm - parts per million, ppb - parts per billion) and particulate impurities (total mass per unit volume of air)
