Hello

I have a question regarding perpetual motion . I have tried to debunk it but I cant seem to find anything wrong with the concept. I think i am missing something so please help.

There is a solid suspended on top of an insulated container full of liquid. It's density would cause it to sink. However, some of kinetic energy from the solid falling is converted into heat energy. This heat energy is enough to raise the temperature of the solid to a point where it's density will decrease to the point where it starts floating. When the solid is at the top, energy is slowly released from the system, and the process repeats.

Wouldn't this system generate far more work then the potential energy that was put into it?

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