V2EX air density

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Air Density

释义 Definition

空气密度：单位体积空气所包含的质量，常用 kg/m 表示。它会随温度、气压、湿度和海拔变化；在空气动力学、气象学与工程计算中很重要。

发音 Pronunciation (IPA)

/er dnsti/

例句 Examples

Air density decreases as temperature rises.
空气密度会随着温度升高而降低。

To estimate aerodynamic drag accurately, engineers must account for changes in air density with altitude and humidity.
为了准确估算空气阻力，工程师必须考虑空气密度随海拔和湿度变化的影响。

词源 Etymology

air 源自古英语 r（空气、气息一类的概念），与“呼吸/大气”相关的含义逐步稳定下来；density 来自拉丁语 dēnsitās（稠密、密集），由 dēnsus（稠密的）派生。合起来 air density 就是“空气的稠密程度（以质量/体积衡量）”。

相关词 Related Words

文学与著作 Literary Works

Richard P. Feynman, Six Easy Pieces（以通俗方式讨论物质与气体性质时常涉及密度等概念）
Bill Bryson, A Short History of Nearly Everything（科普写作中谈到大气与物理量时会用到“空气密度/密度”相关表达）
Isaac Asimov, Asimov on Physics（物理科普文章中讨论气体行为、浮力与大气现象时会出现相关术语）

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