指材料在绝对密实状态下的体积内固体物质的实际体积，不包括内部空隙。（叫真密度）表观密度和堆积密度。 采用李氏比重瓶法测定。
...附性． 目前的颗粒物质相关文献对于这些物理量不够重视，下面具体讨论一些关键且容易混淆的基本参量． 真实密度（true density）或材料密度：颗粒物质总质量与不包括颗粒内外空隙的体积（真体积）的比值． 颗粒密度（granular density）：颗粒物质总质量与包括...
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然而，它们真实的振动本质并没有第三密度的振动特征，因此，当需要时它们能够物质化或者非物质化。
However, their true vibrational nature is without third-density vibrational characteristics and, therefore, they are able to materialize and dematerialize when necessary.
模型中考虑了人群密度对疏散能力的影响，改变以往把建筑出口疏散能力视为常数而带来的不能真实反应其疏散能力的状况。
The model considered the influence of the crowd density on the evacuation capability, and the capacity of the egress was taken as a variable rather than a constant as former.
实测硬质合金刀片的密度和硬度值是一种判断刀片成分真实含量和性能质量指标的有效方法之一。
The measurement of density and hardness of carbide tips is one of effective method to judge the real compositions of carbide tip and index of performance quality.
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