G1.简介 气相环境浓度单位 Environmental concentration units for gases Parts Per Million(ppm, 100) Parts Per Billion(ppb, 109); Parts Per Trillion(ppt, 102 Parts Per Hundred Million(pphm, 108 In order to emphasize that the concentration scale is based upon molecules or volumes rather than upon mass, a v(for volume) is sometimes shown as part of the unit, e. g 100 ppm or 100 ppmv. 1mg/L浓度的硝基苯水溶液相当于1ppm, 在空气中1mg的硝基苯也相当于1ppm吗? 1. 简介 气相环境浓度单位 Environmental Concentration Units for Gases Parts Per Million (ppm, 106 ); Parts Per Billion (ppb, 109 ); Parts Per Trillion (ppt, 1012) Parts Per Hundred Million (pphm, 108 ) In order to emphasize that the concentration scale is based upon molecules or volumes rather than upon mass, a v (for volume) is sometimes shown as part of the unit, e.g., 100 ppmv or 100 ppmv. 1 mg/L浓度的硝基苯水溶液相当于1 ppm， 在空气中1 mg/L的硝基苯也相当于1 ppm吗？