How Matter Changes State: Melting, Freezing, and Evaporation

Next Generation Science

This educational video provides a clear and visually engaging explanation of how matter changes states through heating and cooling. It begins by distinguishing between physical changes that alter shape—such as cutting celery or squishing clay—and phase changes that alter the state of matter itself. The core of the lesson demonstrates the water cycle on a micro scale, showing how ice melts into water and water evaporates into vapor when heated, introducing the concept of conservation of matter by explaining that the "disappearing" water has simply turned into a gas.