浓度
浓度指某物质拉总量中所占个分量。
常用个浓度表示法有：质量百分浓度（质量分数，m/m）、体积分数（体积分数，V/V）、百万分浓度（ppm）、质量摩尔浓度（molality）、质量摩尔浓度（molality）等。
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