< p >它会下降。< / p > < p >为了浮动,一个物体必须取代流体的体积重量一样的船。在一艘船的情况下,体积小于船的总容量,包括里面的空气。这就是为什么它漂浮的舷缘高于水。所以当船漂浮,它取代了一些体积V < em > < / em >,所以相对海平面上升(第二个面板,下面)。< / p > < p > < img src = " https://i.stack.imgur.com/bHskY.png " alt = "船取代水沉没之前和之后。”> < / p > < p >然而,当船被淹没,充满海水,它取代了比原来更小的体积。如果它没有,它就不会沉没(假设它没有改变重量)。< / p >Since it displaces a smaller volume after sinking, relative sea-level must go down. But it will still be higher than it was before the ship was launched.