Substance X is placed in a container with substance Y. Both substances are fluids. Substance X initially sinks to the bottom of the container. After five minutes of being heated on a hot plate, substance X becomes less dense than substance Y. What will most likely happen next?

Heating makes substance X less dense than substance Y, so X will tend to rise above the denser fluid. The movement of fluids caused by differences in temperature and density is convection, not radiation. Therefore, substance X will rise due to convection.

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