We can confirm that if a toy boat was placed in a pool of liquid mercury it would initially float, then tip over and sink.
Why would the boat eventually sink?
Floating has to do with density. Objects that are less dense than others will float to the top. Since boats are made to not be very dense, they float. The problem here is that since mercury is so dense, the boat will float much higher than it would in water, offsetting its center of boancy and causing it to tip over. This would lead to mercury filling the boat and it eventually sinking.
Therefore, we can confirm that if a toy boat was placed in a pool of liquid mercury it would initially float, then tip over and sink.
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