Aliphatic Hydrocarbon : Fatty, belonging to the open-chain class of organic compounds or methane derivatives -contrasted with aromatic or heterocyclic compounds (closed ring skeleton carbon atoms). The gas butane is aliphatic
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}