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本文介绍了美国天然气工业的发展和天然气作为商品由容积计量转变为热能计量的历程。重点介绍了用于天然气热能计量的述语，仪器设备的原理。并举例说明了天然气热能计算的方法。
This article describes the development of the natural gas industry in the United States and the evolution of natural gas as a measure of how energy is converted from volumetric to thermal energy. Focus on the description of natural gas thermal energy terms, equipment and equipment principles. An example is given to illustrate how to calculate the thermal energy of natural gas.