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两种不同的物质ρ1、ρ2相混合,其混合物的密度ρ合有如下两种形式:(1)按体积混合:ρ合=ρ1V1+ρ2V2/V合(当V1=V2时,ρ合=1/2(ρ1+ρ2))(2)按质量混合:ρ合=m合/m1/ρ1+m2/ρ2=ρ1ρ2m合/ρ1m2+ρ2m1(当m1=m2时,ρ合=2ρ1ρ2/ρ1+ρ2)灵活运用上述两式,可以很简单地解决有关混合物类计算题。请看下面几例:例1(95年全国初中物理竞赛)某厂生产的酒精,要求含水量不超过10%,采用抽测密度的方法检验产品的质量,这种酒精的密度应在什
The two different substances ρ1 and ρ2 are mixed, and the density ρ of the mixture is in the following two forms: (1) mixing by volume: ρ=ρ1V1+ρ2V2/V(when V1=V2, ρ=1) /2(ρ1+ρ2)) (2) Mix by mass: ρ=m/m1/ρ1+m2/ρ2=ρ1ρ2m/ρ1m2+ρ2m1 (when m1=m2, ρ=2ρ1ρ2/ρ1+ρ2 ) Using the above two formulas flexibly, it is easy to solve problems related to mixture calculations. Please see the following examples: Example 1 (National junior high school physics competition in 1995) The alcohol produced by a certain factory requires a moisture content of no more than 10%. The quality of the product should be checked by the method of sampling density. The density of this alcohol should be