CHEM 3060 Study Guide - Midterm Guide: Combustion Chamber, Mixing Ratio, Partial Pressure
Document Summary
Protects us from harmful radiation from the sun while allowing useful radiation through. O3 + hv (uv) o2 + o + energy. Mesosphere: less ozone, no energy input so temperature decreases with height, rapid mixing occurs, 50-85 km, at mesopause, pressure drops to about 1/100 000 of atmospheric pressure at sea level (1e-05 atm) Mixing ratio, xx (mole fraction: volume occupied by an ideal gas is proportional to the number of moles at the same pressure, mixing ratio is constant when pressure or temperature change. Midterm 1 cram sheet: parts per million (ppm): 1 ppm = 10-6 mol/mol, parts per billion (ppb): 1 ppb = 10-9 mol/mol, parts per trillion (ppt): 1 ppt = 10-12 mol/mol. Vapour pressure and h2o: h2o is found everywhere in the atmosphere. Atmospheric column: useful for measuring the total impact of a species on solar radiation entering the atmosphere, o3 absorbs potentially harmful uv radiation in the uv-b region of the spectrum.
