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(zhì)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(jìn)行的鼕小麥根系田間實(shí)測(cè)資料，研究了根長(zhǎng)密度和根質(zhì)量密度在砂壤土中的垂直分佈。
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(zhì)量守恒定律，質(zhì)量密度增量來自未撓動(dòng)的質(zhì)量密度的散度和位移矢量場(chǎng)。

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