mass density

基本解釋

"The traffic density in a big city is like the mass density in a lens galaxy, " Marshall said.
大城市的交通密度就像透鏡星系的物質密度。
Based on the measured data from the winter wheat fields in Zhengzhou of Henan Province, the vertical distribution of root length density(RLD)and root mass density(RMD)were analyzed.
根據(jù)在鄭州進行的冬小麥根系田間實測資料，研究了根長密度和根質量密度在砂壤土中的垂直分布。
According to the law of mass conservation the incremental mass density can be inferred from the divergency of the scalar unperturbed mass density and the vectorial displacement field.
由質量守恒定律，質量密度增量來自未撓動的質量密度的散度和位移矢量場。

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