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From the concept of floating, archimede’s idea, any object displaces its own weight in the fluid in which it floats, so the reason is simple in that; a good portion of the interior of the boat is air (unlike a cube of steel, which is solid throughout). The average density of a boat ( the combination of the steel and the air ) is very light compared to the average density of water while average density of solid steel is greater than average density of water. So very little of the boat actually has to submerge into the water before it has displaced the weight of the boat. Thus the boat floats while a solid steel sinks.
simply the boat is hollow to displace large volume of water hence provides sufficient upthrust force
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