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In the bottle of water in front of me. It contains about 1 sixtillionths of 1 percent the world's water which, as required, is less than 1 hundredth of 1 percent.
The ships are not made of solid iron. They contain much empty space where the cargo and or passengers go. So the overall density of a ship: its TOTAL mass divided by its TOTAL volume is less than that of water.
Oh, what a lovely question! You see, both 1 kilogram of copper and 1 kilogram of iron have the same weight because they both weigh 1 kilogram. However, copper is denser than iron, so a 1-kilogram block of copper will take up less space than a 1-kilogram block of iron. It's all about how tightly packed the atoms are in each material.
A bucket of water is heavier than a bucket of snow when both are of the same size. This is because water is denser than snow; snow contains a significant amount of air, which makes it lighter. Thus, even a full bucket of snow will weigh less than a full bucket of water.
Since one Kg of iron is much more dense (the weight is concentrated in a smaller area) than cotton, it takes up less space.