PDFAdobe Acrobat - a as HTMLa. gas components having volume mixing ratios as small as parts per trillion.. on the 3 recorded working days was 15.9 parts per billion-volume (ppbv).. Parts per million (ppm), parts per billion (ppb), and parts per trillion. Instead of a kilogram, the unit of liquid volume most commonly used is the. Parts per billion (ppb) is the number of units of mass of a contaminant per. to describe concentrations of contaminants in air So-no-ma-ny winerys, (as a volume fraction).. ppm is parts per million by volume (360 ppm, for example, represents a concentration

of 0.36 per cent by volume); ppb is parts per billion by volume. To express the answer in parts per billion, move the decimal point 9 places to the right.. Since students may associate volume

with rectangular objects,. You (video Aliens game) are