指材料在自然状态下，单位体积所具有的质量，与密度（又称实际密度）、堆积密度要区分开来。
试验中发现了若干表现密度与切削阻力关系分散性的某些特点的现象。
Some phenomena were noted during the tests indicating certain characteristics of the scatter of the density-cutting resistance relation.
结果表明，用粉煤灰陶粒所配制的轻集料混凝土强度较高，干表现密度和热性能均能满足设计要求，而且更经济。
Study results show that sintered fly ash aggregate concrete is relatively high in strength and more economical in use, and its dry density and thermal properties can meet design requirements.
多形性胶质母细胞瘤 CT 表现为低密度影，瘤内卒中表现为高密度。
CT appearance of glioblastoma multiforme was low density image, intratumorally apoplexy was high density image.
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