Why Does Sugar Dissolve Faster in Hot Water? | RapidSmartFacts

Try this: drop sugar into cold water, then hot water. The hot cup

wins fast. The reason is all about motion and energy. Sugar dissolves when

water molecules pull sugar molecules away from the crystal. In hot water, molecules move faster.

That increased motion helps water bump into sugar more often. More collisions means

sugar molecules get separated and carried into the water quicker. Heat also weakens

the forces holding sugar crystals together. So the surface breaks down faster. Stirring speeds things

up even more by constantly bringing fresh water. To the sugar’s surface.

Cold water still dissolves sugar just with slower molecular movement and fewer effective collisions.