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應該理解為:物體在水中受到的浮力的大小等於物體所排開的水的重量(重力)的大小.這裡強調兩者數值大小相等,不能籠統地說“……浮力=……重力”.因為“力”作為物理量,它除了大小還有方向性,浮力向上而重力向下,二者只能平衡而不能相等.
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