...................Polymers115Reading2..............Polymersandtheir八dditives122Unit14PowderCoatings................................128ReadingPowderCoatingSystem.................128PartFourEnergySourcesandEnvironmentalProtection...........................................................132Unit15EnergySources-Coal.........................132Reading1.....................................................Coal132Reading2.................................bustion140Reading3.................................CoalGasification146Reading4................................CoalLiquefaction152Unit16EngineeringandEnvironment............158Reading1EngineeringandEnvironment.....158Reading2......OverviewofEnvironmentalIssues160Reading3......AutomobilesandtheEnvironment165Reading4.......PCBsintheAquaticEnvironment