适用于适用于适用于适用于： ：： ：量测不具渗透性材料与产品的密度 (Impermeable Density)， 又称为视密度 (Apparent Density)。
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随着移动电子产品的密度越来越高，底层填充技术逐步提高，越来越多的底层填充材料被研发。
As the density for mobile electronic product becomes higher and higher and underfill technology improved, more and more underfill material have been developed.
2007年版的产品略长(显然主要因为烟杆较长)填充密度较高，不过，水分含量略低。
The 2007 versions of these products were slightly longer (apparently mostly attributed to longer tobacco rods), and had slightly higher packing density, but slightly lower moisture content.
生产出来泡沫铝的密度决定了该产品的强度。
The density of the bubbles determines the strength of the products produced.
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