① material weight and 4 ℃, the weight of water with volume ratio, called the proportion of the substance. ② share one thing in the whole weight of our industry in the whole national economy ~ year to year.
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bǐ zhòng
The density of a substance taken as standard with a substance (for example, its maximum density at 4 ° C when the temperature of water) density ratio (both weighing in air density are obtained)
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No. 3
Share something in the overall weight of
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No. 4
Industry's share in the national economy
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No. 5
The weight of the object and its volume ratio. Some countries object to the provisions of the proportion of the weight and the same volume of pure water at 4 ℃, the ratio of the weight. For example, the proportion of gold is 19.3, the proportion of mercury is 13.55.
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No. 6
Share one thing in the overall weight. Mao Zedong's "On the Ten Major Relationships" Three: "The first five-year plan period, the military and political costs in the state budget, 30 percent of total expenditures. The proportion too."
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No. 7
比重 specific gravity
也称相对密度，固体和液体的比重是该物质的密度与在标准大气压，3.98℃时纯H2O下的密度（999.972 kg/m3）的比值。气体的比重是指该气体的密度与标准状况下空气密度的比值。液体或固体的比重说明了它们在另一种流体中是下沉还是漂浮。比重是无量纲量,即比重是无单位的值，一般情形下随温度、压力而变。比重简写为s.g.
密度是有量纲的量，比重是无量纲的量。
①物质的重量和4℃时同体积纯水的重量的比值，叫做该物质的比重。
②一种事物在整体中所占的分量：我国工业在整个国民经济中的～逐年增长。
补充：中国在有些书籍中，把单位体积内所含物质的重量也译成比重。它大体也能指示物体在水中的沉或浮，现在通称它为单位体积重量，可用符号ω表示。ω和s.g.有所不同。ω和密度ρ之间的关系为ω＝ρg,式中g为该地的重力加速度。g 随地区和高度不同而变化,所以ω也随着变化。
地质
地质上矿物的重量与4℃时相同体积的水的重量比，称为矿物的比重。矿物的化学成分中若含有原子量大的元素或者矿物的内部结构中原子或离子堆积比较紧密则比重较大；反之比重较小。大多数矿物比重介于2.5-4之间；一些重金属矿物常在5-8之间；极少数矿物（如铂族矿物）可达到23.
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百科辞典
bizhong
比重 specific gravity
某物质的重量与摄氏4度时同体积纯水重量比。运用比重关系可测定人体的某些排泄物，如尿比重测定、胸水比重测定。
English Expression
: mass of any substance in relation to an equal volume of water, SP.g.r. specific gravity, specifie weight, specific weight, specific density
n.: compactness, density, specific gravity, proportion