空隙量的表示方法有：1）表观密度（apparent density）即单位体积粉体层的质量。2）气孔率（porosity）即粉体层中空隙部分所占的容积率。
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2009年《蓄电池》杂志文章摘要 - 书刊 - 蓄电池·中国 关键词： 铅膏；湿和法；干和法；视密度；稠度 [gap=708]Key words: leady paste; wet mixing; dry mixing; apparent density; denseness
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apparent density of film 皮膜表面密度
Water Absorption and Apparent Density 表观密度和吸水率
Determination of apparent density 表观密度的测定 ; 表观密度测定
dry apparent density of concrete 混凝土干表观密度
apparent density of fresh concrete 混凝土湿表观密度
Dry apparent density 干表观密度
Among them, test methods of apparent strength and elementary strength are promethean in today’s pervious concrete researches. Apparent density is a new method which based on the large area of road construction.
其中,透水混凝土表观强度及实材强度试验方法是在现今透水混凝土的研究中具有独创性的;表观密实度也是根据路面大面积施工提出的一个新方法。
参考来源 - 透水混凝土配合比设计及性能研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The foamed ceramic material with high open porosity is characterized by low apparent density , high permeability, and resistance to high temperature and chemical corrosion.
泡沫陶瓷具有密度小、透气性高、耐高温、抗化学腐蚀等特性。
The effect of apparent density on the critical feed height is given as well.
同时指出了松装密度对临界堆料高度的影响。
The apparent density of stone masonry of gravity DAMS is very important to dam safety.
重力坝砌体容重对大坝的安全影响很大。
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