number density of molecules
分子数密度 -每单位体积的物质的克分子数
Density: (1)In physics, it is an identification of material by noting its mass per unit volume.
（1）在物理学上，是以每单位体积的质量来鉴别物质。
The quantity of something per unit measure, especially per unit length, area, or volume.
密度某物每单位测度的数量，尤指每单位长度、面积或体积
a unit of measurement of volume or capacity.
测量体积或容积的单位。
A volumetric unit for measuring the flow of liquids, equal to one cubic foot per second.
立秒一种测量液体流量的体积单位，等于立方英尺每秒
a board measure = 1980 board feet.
木材体积单位=板英尺。
a metric unit of volume or capacity equal to 10 liters.
公制体积单位等于升。
"The number of individuals, such as inhabitants or housing units, per unit of area."
每单位面积居民或住房的数目.
a measure of the amount of flux per unit of cross sectional area.
每单位相交区域面积上的磁通量。
There are four units in one level. The sizes of the units are140 square meters and180 hundred square meters.
每层有四个单位，单位面积有140平米和180平米两种。
The number of individuals, such as inhabitants or housing units, per unit of area.
人口密度每单位面积居民或住房的数目
Force applied uniformly over a surface, measured as force per unit of area.
压力；压强统一作用于物体表面的力量，用每一单位面积上的压力计量
the ratio of the change in pressure acting on a volume to the fractional change in volume.
作用在单位体积上的压力和体积变化量的比值。
Difference between castable amount per unit volume and bulk density
耐火浇注料单位体积用量与体积密度的差异
a metric measure of volume or capacity equal to a cube 1 millimeter on each edge.
公制体积或容积单位等于边长为一毫米的立方体的体积。
a United States unit of capacity or volume equal to 1.804 cubic inches.
美国容积或体积单位等于（待查表）立方英寸。
The mass of one unit of volume of a material is called its density.
物质单位体积的质量称之为密度。
a unit of volume (as for sand or gravel).
用于测量沙石的体积单位。