Hot and Cold Water Convection

One arrangement stays layered; the other mixes dramatically. Ask students to predict what will happen. Stack containers carefully hot-over-cold, then cold-over-hot. Key idea: Warm water is less dense and rises while cold water sinks. Ask: Which arrangement is stable? Safety and cleanup: Teacher handles warm water; use tray. https://www.google.com/search?q=%22Hot+and+Cold+Water+Convection%22+science+demonstration+experiment