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某種物質組織體積的質量叫做這種物質的密度.密度的國際主單位是千克/米3,計算公式是ρ=m/v .密度是物質本身的一種内容,它不隨物體的形狀、狀態而改變,也不隨物體的位置而改變.一杯水和一桶水的質量不同,體積不同,但…
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