气干密度是一个强度指标。在生产、流通贸易等实际应用中，常用气干密度这一指标。气干材重量除以气干材体积为气干密度。
木材就更不同了，木材用气干密度（air-dry density）作为强度指标：木材在一定的大气状态下达到平衡含水率时的重量与体积比，以每立方厘米之克数为单位。
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... Air-dried Sand 风干之沙 air-dried density 气干密度 air-dried moisture 空气干燥基水分 ...
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The differences of air-dried density were significant in the order ridge (0.451 g/cm3 ) >mountam top(0.411 g/cm3)>south hillside(0.396 g/cm3)>mountain valley(0.381 g/cm3) among the trees of 0.5meter height in different growth environments.
不同生长环境的气干密度差异显著，其大小顺序为。
参考来源 - 不同生长环境的杉木木材解剖研究The calibration was used to predict the air-dry density of random selected samples, which weren’t contained in the density calibration model. The prediction result is good, with coefficient of determination (R2) of 0.9106.
将此模型对未参与建模的随机挑选的样品气干密度进行预测,决定系数R2=0.9106。
参考来源 - 利用近红外光谱技术预测粗皮桉木材微纤丝角和气干密度的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
两种木材的力学性质与气干密度表现为显著的正相关关系。
There was a remarkable positive correlation between mechanical properties and air-dried density for two wood species.
种源内木材气干密度、力学强度及胞壁率差异不显著，管胞长、宽和壁厚的差异均显著且高于种源间的差异。
Meanwhile, there were not significant differences in wood air dry density, mechanical strength and cell wall percentage of intra provenance.
在物理力学性质指标中成熟材的基本密度、气干密度、顺纹抗压强度、抗弯强度、抗弯弹性模量及冲击韧性高于幼龄材；
In physical and mechanical indexes, the basic density, air-dried density, compression strength parallel to grain, MOR, MOE and toughness of mature wood are higher than that of juvenile wood.
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