All natural gas processes, including production, sweetening, drying, transportation, storage, metering and selling requires that we possess ability to predict with great accuracy its volume, pressure, temperature, specific heat capacity etc. Unlike an ideal gas, a real gas does not expand and contract according the simple pressure-volume-temperature relation.

This deviation from the ideal gas behavior is corrected with the use of z-factor. Z factor is simply the ratio of the volume of a real gas to that which equal mass of an ideal gas will occupy under the same condition. Several computational methods of obtaining this factor have been developed, but the implicit nature of these correlations called for an explicit method of evaluating the multivariate parameter.

In this paper, over 6000 data points prepared by careful laboratory measurement of behavior of natural gas mixture is used to develop the model. The result was found to match the result to a very high accuracy without over fitting.

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