Why does a ship remain afloat on water?
Answers
Answer:
Buoyancy - The upward force exerted by a liquid on anything submerged in it and will be equal in magnitude to the weight of the liquid displaced by the body which has been submerged.
Explanation: A ship uses the principle of Buoyancy. Ships though looking heavy, have large volumes of air in them. This reduces their mass to much lower amounts compared to their volume. ie; their density is lowered. Even though steel, iron,...etc, are very dense materials, the way in which a ship is build allows it to reduce the effective density below that of sea water. Anything which is of lower density than a liquid will float on it by only being partially submerged. Even if densities are exactly the same, the substance is said to just float. ie; it's body just graces over the surface over the water. Anything with a larger density will sink for sure. This is why a solid iron sphere will sink while a thin iron shell (hollow) of the same mass floats as the resultant density is much lower.
The lower density causes lower volume of water to displaced compared to the volume of the submerged object. But the water displaced is of the same weight as that of the body which is submerged and the upward buoyant force will be of the same magnitude thus countering the weight. Thus without completely sinking, the body is able to float.
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