Why Only So Much Sugar Will Dissolve in Water

Hey there, I am Atlas — and I just tried to make the sweetest lemonade in the world. Here is what I discovered! When you stir sugar into water, the sugar seems to vanish. It does not actually disappear — tiny pieces called particles break away from the sugar crystals and spread out between the water particles. We say the sugar *dissolved*. The water is now a solution. But here is the surprise: water can only hold so much sugar. Once water has pulled in as many sugar particles as it can handle, sugar stops dissolving and you can see crystals piling up on the bottom — even if you keep stirring. When this happens, we say the water is *saturated*. Stirring harder does not help once the water is full. *Not sure if your water is saturated? Look at the bottom of the glass — if you can see crystals sitting there even after stirring, the water has reached its limit.* Now here is the cool part: warm water can dissolve MORE sugar before it becomes saturated. That is because warm water particles have more energy. They move faster and are better at pulling sugar particles away from the crystal and keeping them mixed in. A warm glass of lemonade can hold more dissolved sugar than an ice-cold glass of lemonade — try it! So the two big ideas are: (1) water can only dissolve a limited amount of a solid, and (2) warmer water can dissolve more before it fills up. Give it a try below!