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A 1/2 kg sheet of tin sinks in water but...

A `1/2` kg sheet of tin sinks in water but if the same sheet is converted into a box or boat, it floats. why ?

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The correct Answer is:
The sheet of tin sinks in water because the density of tin is higher than that of water; When the same sheet of tin is converted into a box (or boat) then due to the trapping of lot of light' air in the box (or boat) the average density of box (or boat) made of tin sheet becomes lower than that of water and hence it floats in water.
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