天然气偏差因子是天然气工程计算中一项相当重要的参数，该参数普遍采用相关经验公式计算。
Gas deviation factor being a very important parameter in gas engineering calculation was calculated by use of empirical formulas in general.
目前主要通过PVT取样分析测定和相关经验公式来确定它，前者费用高，后者精度差，给饱和压力的确定带来困难。
It is defined by PVT sampling analysis with high cost and related experience formulae with low accuracy at present, so it is difficult to define the saturation pressure.
并将相关数学模型以经验公式的形式进行了总结，对碎石土强夯地基的检测具有指导意义。
The associated mathematic model has been summarized by using empirical formulae, which will guide the detection of the heavily compacted broken stone filled in foundation.
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