es ▁from ▁the ▁point ▁of ▁origin ▁directly ▁to ▁the ▁place ▁of ▁consumption . ▁ ▁F uel ▁gas ▁is ▁contrast ed ▁with ▁liquid ▁fu els ▁and ▁from ▁solid ▁fu els , ▁though ▁some ▁fuel ▁g ases ▁are ▁li que f ied ▁for ▁storage ▁or ▁transport . ▁While ▁their ▁g ase ous ▁nature ▁has ▁advantages , ▁avoid ing ▁the ▁difficulty ▁of ▁transport ing ▁solid ▁fuel ▁and ▁the ▁d angers ▁of ▁sp ill age ▁inher ent ▁in ▁liquid ▁fu els , ▁it ▁also ▁has ▁limitation . ▁It ▁is ▁possible ▁for ▁a ▁fuel ▁gas ▁to ▁be ▁und et ected ▁and ▁collect ▁in ▁certain ▁areas , ▁leading ▁to ▁the ▁risk ▁of ▁a ▁gas ▁explos ion . ▁For ▁this ▁reason , ▁od or izers ▁are ▁added ▁to ▁most ▁fuel ▁g ases ▁so ▁that ▁they ▁may ▁be ▁detected ▁by ▁a ▁distinct ▁sm ell . ▁ ▁The ▁most ▁common ▁type ▁of ▁fuel ▁gas ▁in ▁current ▁use ▁is ▁natural ▁gas . ▁ ▁Types ▁ ▁There ▁are ▁two ▁broad ▁classes ▁of ▁fuel ▁g ases , ▁based ▁not ▁on ▁their ▁chemical ▁composition , ▁but ▁their ▁source ▁and ▁the ▁way ▁they ▁are ▁produced : ▁those ▁found ▁naturally , ▁and ▁those ▁manufact ured ▁from ▁other ▁materials . ▁ ▁Man ufact ured ▁fuel ▁gas ▁ ▁Man ufact ured ▁fuel ▁g ases ▁are ▁those ▁produced ▁through ▁an ▁artificial ▁process , ▁ ▁usually ▁gas ification , ▁at ▁a ▁location ▁known ▁as ▁a ▁gas works . ▁ ▁Man ufact ured ▁fuel ▁g ases ▁include : ▁ ▁Co al ▁gas ▁ ▁Water ▁gas ▁ ▁Produ cer ▁gas ▁ ▁Sy ng as