All Matter Is Made of Tiny Particles Too Small to See

Have you ever watched sugar disappear into a glass of water? You stir and stir, and suddenly — it's gone. Where did it go? Here is the big idea: everything around you is made of incredibly tiny particles. Your desk, the air you breathe, the water in your cup — all of it. Scientists call these particles atoms and molecules. Some particles are single atoms — like iron. Others are groups of atoms stuck together called molecules — like water or sugar. Either way, particles are so unimaginably small that hundreds of thousands of them could fit in a single line across one strand of your hair. That is why you cannot see them, even if you use a magnifying glass. A magnifying glass makes things look bigger, but particles are far, far too small — no school magnifying glass or classroom microscope can reveal them. Scientists use incredibly powerful special instruments — far more powerful than any school microscope — to study particles. Some of these instruments can even show us pictures of individual atoms! So when sugar dissolves, the sugar particles do not vanish — they spread out and mix in between the water particles. The matter is still there; it is just too spread out to see. Here is a clue that particles are real even when invisible: if you leave a bowl of water on the counter, it slowly disappears into the air. The water particles escaped one by one into the air around you. You cannot see them leave, but the empty bowl is your evidence! Remember: matter never disappears — it is always made of particles, even when those particles are hiding from your eyes.