The mass density or density of a material is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho).
详细百科解释
其他语种释义
densityとは意味:density n. 密度; 〔物理 化学〕 濃度, 比重. 【動詞+】 ◆The planet has a density of five and a half times that of water. その惑星は水の 5.5 倍の比重をもつ The city has a population density of 4,275 persons per sq km. その都市は 1 平方キロメー...