What makes the juice evaporate and the pulp float?

Juice evaporates due to the application of heat, which increases the temperature and energy of the liquid, causing water molecules to transition from a liquid state to vapor. The pulp, being denser and composed of solid matter, tends to float because it is less affected by the heat and retains its structure, allowing it to remain suspended in the liquid. Additionally, the difference in density between the pulp and the evaporating juice contributes to this separation.