题干

有一质量为0.5千克的空瓶,用它装满水,水和瓶的总质量是2千克。

①酒精密度为0.8×103千克/米3,若用此瓶改装酒精,最多能装下多少千克?

②若用此瓶改装另一种液体,装满时称得液体的瓶总质量是3.2千克,这种液体密度是多少?

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答案(点此获取答案解析)

解:瓶内水的质量m水=m瓶+水-m瓶=2kg-0.5kg=1.5kg,由 ρ=
m
V
得,

水的体积:

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