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单词 Average density
释义

Average density

原声例句
时间简史(原版)

However, our uncertainty about the present average density of the universe is even greater.

然而,我们对目前宇宙平均密度的不确定性更大。

传说之境

While Oahu has an average density of about 1700 people per square mile, a massive 34 times as dense as the Big Island and denser than any US state is on average.

欧胡岛的平均人口密度约为每平方英里 1700 人,是大岛人口密度的 34 倍,比美国任何一个州的平均人口密度都要高。

传说之境

This is what makes the Big Island an overall very rural place in comparison with an average population density of only about 50 people per square mile which is about the same as the state of Maine.

因此大岛整体上是一处乡村气息非常浓厚的地方,相比之下,平均人口密度约为每平方英里 50 人,与缅因州的人口密度差不多。

中文百科

密度 Density

(重定向自Average density)
量筒中有不同颜色、不同密度的液体
La densidad del aire frente a la temperatura.
Un densímetro automático que utiliza el principio del tubo en U oscilante.
Picnómetro.

| bgcolour = {default} | name = 密度 | image = | caption = | unit = kg/m | symbols = ρ
D | derivations = }->

密度是指一物质单位体积下的质量,常用希腊字母ρ或是英文本母D表示。在数学上,密度定义为质量除以体积的商:

其中ρ为密度,m为质量,V为体积。

有时(例如美国的石油业或天然气产业)会将密度定义为单位体积的重量,不过在科学上是不精确的,此物理量应称为重率

英语百科

Density 密度

(重定向自Average density)
A graduated cylinder containing various coloured liquids with different densities.
Air density vs. temperature
Un densímetro automático que utiliza el principio del tubo en U oscilante.
Picnómetro.

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume:

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更新时间:2025/6/19 11:52:00