The unique properties that each composition has, for example, their volatility polarity, or the presence of certain functional groups, sets the basis for their separation and identification using any of the methods available for {HEAD ~ the separation} and {TAIL ~ characterization} of gases 
The unique properties that each composition has , for example , their volatility polarity , or the presence of certain functional groups , sets the basis for their separation and identification using any of the methods available for { HEAD ~ the separation } and { TAIL ~ characterization } of gases
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