气体不仅密度低，而且具有很大的可压缩性，所以空气钻井的体积流量将随压力和温度变化，而压力和温度又随井深变化。
Air has a low density and great compressibility. The volumetric flow rate of air in air drilling varies with pressure and temperature, which in turn, change with WLL depth.
它也认识到，体积密度的气体质量相当大的影响，因为它影响在火灾中燃料的停留时间，燃油流速和气体流量。
It is also recognised that bulk density has considerable impact on gas quality, as it influences the fuel residence time in the fire box, fuel velocity and gas flow rate.
通过考察体积传质系数，确定了纤维液膜萃取分离器的最佳填充密度和最佳流量比。
By analyzing the volume mass-transfer coefficient, the optimal operating flow-ratio and packed density were obtained.
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