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假設有10g這樣的酒精 含水量是20%,那麼水的質量就是2g,水的密度是1g/cm3,那麼水的體積就是2cm3 酒精的質量是8g,密度是0.8g\cm3,那酒精的體積就是10cm3 那麼這10g酒精的體積就是12cm3,平均密度就是10/12=5/6g/cm3
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