* Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.
* When you drop a sugar cube into hot water, the sugar molecules are initially concentrated within the cube. The water molecules have a much lower concentration of sugar.
* The heat from the water causes the sugar molecules to move more rapidly, increasing their kinetic energy.
* This increased movement allows the sugar molecules to spread out and move into the water, where they are less concentrated.
* As the sugar molecules diffuse, the water will eventually become evenly sweet, with a uniform sugar concentration.
In summary: The sugar cube dissolving in hot water is driven by the process of diffusion, where sugar molecules move from an area of high concentration (the cube) to an area of low concentration (the water), ultimately reaching a state of equilibrium.
