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則一瓶水的體積:V水=m水ρ水=0.5kg1.0×103kg/m3=5×10-4m3;由題意可知,V煤油=V水,則一瓶煤油的質量:m煤油=ρ煤油V煤油=0.8×103kg/m3×5×10-4m3=0.4kg.故答案為:0.4.
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