Video narration
Why does sugar water stay clear while muddy water settles-and where does milk fit? All three are mixtures, but a uniform appearance does not decide the class. Particle size and behavior do. In sugar water, sugar particles are tiny and spread evenly. They do not settle, scatter light, or get caught by ordinary filter paper. That is a true solution. Milk looks uniform, but its particles are intermediate in size. They stay spread out, do not quickly settle, and scatter light. This is a colloid. Muddy water has the largest particles. They make the mixture uneven, settle when left standing, and can be separated by ordinary filtration. That is a suspension. These three may look similar, but hidden particle behavior separates them. Smallest: true solution; middle-sized: colloid; largest: suspension. Milk is the colloid, sugar water a true solution, and muddy water a suspension.