This International Standard defines the various terms (be they words or Symbols) employed in the calculation of meteredPetroleum quantities. Where two or more terms are customarily employed in the oil industry for the same quantity, a preferred term is selected. This International Standard also specifies the equations which allow the values of correction factors to be computed. lt also gives rules for the sequence, rounding and significant figures to be employed in a calculation. lt provides tables which may be used to look up specific correction factors should it not be . desired to calculate them by manual as well as Computer methods. The calculation of prover base volumes, meter factors and measurement tickets is also covered. The field of application of this International Standard is the volumetric measurement of liquid hydrocarbons, including liquefied Petroleum gases, by meter and prover. lt does not include two-Phase fluids (though it may be found useful in such situations) except in so far as Sediment and water may be mixed in with crude Oil.