Natural Gas 13
Natural Gas 13 : Gas found in certain localities issuing from the earth under pressure and often produced in association with crude petroleum when it acts as an important factor in the recovery of the latter. Natural gas is usually classified as "wet" or "dry", depending on whether the proportions of gasoline constituents which it contains are large or small. Natural gas is also referred to as "casinghead gas" and "North Sea" gas. (Inst. Pet