Hot/Cold Convection Tank

Warm rises and cold sinks into visible currents. Ask students to predict what will happen. Release colored warm/cold water carefully. Key idea: Temperature changes density, driving convection. Ask: How does heat make water move without stirring? Safety and cleanup: Warm—not scalding—water; tray. https://www.google.com/search?q=%22Hot%2FCold+Convection+Tank%22+science+demonstration+experiment