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水結冰後,質量不變.即:m冰=m水 m水=ρ水×V水=1×10³;kg/m³;×36×10-³;m³;=36kg V冰=m冰/ρ冰=36kg/(0.9×10³;kg/m³;)=40×10-³;m³;=40dm³;
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