“柱密度”是天文学专有名词，指单位面积为底面的整个柱状区域中物质的数量。
The HeⅠrequires a column density of hydro-gen in an HⅡregion of greater than 1020 cm-2.
HeⅠ的吸收线强度比要求大于10~(20) cm~(-2)的氢柱密度。
参考来源 - 活动星系核中窄发射线的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
采用药柱密度测量技术和密闭爆发器试验，分析了试样的损伤程度，并对损伤装药的燃烧性能进行了研究。
The effects of physical dimension(inner diameter and length-to-diameter ratio) on the combustion performance of a tubular variable-burning-rate gun propellant were investigated by closed bomb test.
利用气体型流体进行欠平衡钻井，或钻易漏地层时，流体密度及井下液柱压力的确定十分重要。
When underbalanced drilling or drilling easy leaky zone by using aeration fluid, the determination of fluid density and downhole fluid column pressure is very important.
结果表明，施加水再压缩对提高等离子弧柱的能量密度和稳定性、进而提高陶瓷件切割质量非常有效。
It is shown that the water constriction is effective on improving the energy density and stability of the arc, so the cutting quality can be improved also.
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