Bimetal Strip Bends with Heat

Strip bends by itself. Ask students to predict what will happen. Warm strip gently, then cool it. Key idea: Two bonded metals expand by different amounts. Ask: Why does one strip curve instead of just getting longer? Safety and cleanup: Teacher handles warm source. https://www.google.com/search?q=%22Bimetal+Strip+Bends+with+Heat%22+science+demonstration+experiment