What Is Matter? Solids, Liquids, and Gases Explained

Crash Course Kids

Host Sabrina Cruz introduces students to the fundamental scientific concept of matter in this engaging Crash Course Kids episode. The video breaks down the core definition of matter as anything that has weight and takes up space (volume), moving beyond simple definitions to provide concrete examples and demonstrations that make abstract concepts tangible for young learners. The content explores the three primary states of matter—solids, liquids, and gases—providing familiar examples for each. A significant portion of the video is dedicated to proving that invisible matter, specifically air (gas), is indeed matter. Through two clear experiments, the host demonstrates that air has volume (it fills a balloon that then won't fit in a small box) and weight (a balloon filled with air weighs more than an empty one on a balance scale). This video is an excellent instructional tool for introducing physical science units in elementary classrooms. It effectively addresses the common misconception that gases aren't "real" matter because they are invisible, provides a clear definition of volume suitable for young students, and models the scientific method through simple, replicable experiments.