Diet vs Regular Soda Float Test

1. Diet vs Regular Soda Float Test Materials: Unopened diet and regular soda cans; water tub What you do: Place both cans in water. What students see: One may float while the other sinks. Question: What is different inside two cans that look the same? 2. Hot/Cold Convection Tank Materials: Clear tank; warm red water; cold blue water; dividers/cups What you do: Release colored warm/cold water carefully. What students see: Warm rises and cold sinks into visible currents. Question: How does heat make water move without stirring? 3. Bimetal Strip Bends with Heat Materials: Bimetal strip/thermostat element; warm air/hot water What you do: Warm strip gently, then cool it. What students see: Strip bends by itself. Question: Why does one strip curve instead of just getting longer?

Predict → observe three demonstrations → compare what changed → choose independent activity station → cleanup/share. Guiding questions: Question: What is different inside two cans that look the same? Question: How does heat make water move without stirring? Question: Why does one strip curve instead of just getting longer?