Experiment: When the batteries touch the water at opposite sides, a swirling motion (tornado) can form inside the glass.

🎯 Aim of the Experiment

To observe how electric current passing through water can create movement (a tornado) due to chemical and physical reactions.

👉 Download Free Printables from Kidpid

🧰 Materials Required

  • 1 transparent glass
  • Clean water
  • 2 small batteries (AA or AAA)
  • Optional: a pinch of salt (to increase conductivity)

⚙️ Procedure (Step-by-Step)

  1. Fill the glass with clean water.
  2. (Optional) Add a small pinch of salt and stir.
  3. Hold one battery in each hand.
  4. Carefully place the positive end of one battery and the
    negative end of the other battery at opposite sides.
  5. Ensure they do not touch each other directly.
  6. Observe the water closely.

🌪️ Observation

  • Tiny bubbles may form near the battery ends.
  • A small circular motion starts at the surface.
  • Gradually, the motion becomes stronger and forms a vortex (tornado-like motion).
  • The vortex may start small at the top and grow larger downward.

🧠 Scientific Explanation

This experiment works due to a combination of:

1. ⚡ Electrolysis of Water

  • When batteries are placed in water, they create an electric current.
  • This current splits water into gases:
    • Hydrogen (H₂)
    • Oxygen (O₂)
  • These gases appear as tiny bubbles.

2. 🔄 Movement Due to Bubble Formation

  • The bubbles rise upward.
  • This upward motion disturbs the water and creates circulation currents.

3. 🌪️ Formation of Vortex

  • As currents interact, water begins rotating.
  • This rotation becomes organized into a vortex (spiral flow).

⚠️ Safety Precautions

  • Do not keep batteries in water for too long.
  • Avoid using damaged or leaking batteries.
  • Perform under adult supervision (important for kids).
  • Do not drink the water after the experiment.

💡 Conclusion

This experiment shows how electric energy can be converted into motion through chemical reactions.
The vortex forms because of electrolysis and fluid movement, demonstrating basic principles of physics and chemistry in a simple and fun way.

 

Kids Corner
Banner

About the Author

Content Team

Kidpid Content Team is a team of experienced educators, curriculum researchers, and child-focused content creators specializing in early childhood and primary education. The team develops high-quality, research-based worksheets, learning activities, and educational articles aligned with age-appropriate learning standards. Every resource is carefully reviewed to ensure accuracy, clarity, and educational value, making Kidpid a trusted platform for parents, teachers, and schools worldwide.

View All Articles