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Title: Mass MEASUREMli:NT Of Natural Gas Liquid Mixtures
Author: Daniel m. Comstock
Source: 1997 International School of Hydrocarbon Measurement
Year Published: 1997
Abstract: Most petroleum products are measured and sold on a volumetric basis. In other words, product is often sold in U.S. Gallons or petroleum barrels. However, they are nonetheless transferred on a mass basis in actuality. These seemingly contradictory statements can be easily explained by going back to the basics. Volume is a cubical function of length. The standard unit of length is the meter. One inch is exactly 0.024 meters or 2.54 centimeters. The U.S. gallon is exactly 231 cubic inches and the petroleum barrel is made up of 42 U.S. gallons. Volume defines a three dimensional sjiace. The gross volume of a liquid is really the cubiical space occupied by the liquid. However, all liquids are subject to changes in density with changes in pressure and temperature, and they all exhibit the MASS DENSITY X VOLUME relationship. Therefore, the volumes of liquids change with pressure and temperature also, but they do so inversely.

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