mcf
mcf.abbr. Oil & gas. One thousand cubic feet, one of the standard units for measuring natural gas.
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free gas clause
free-gas clause. Oil & gas. A provision in an oil-and-gas lease entitling the lessor or the surface owner to use gas produced from the leased property without charge. • Used commonly in colder states, free-gas clauses usu. limit how the gas may be used (e.g., domestic heating and light), how much gas may be used