Acoustic Water Chime Tuned Hydrophone Resonance Experiment

30 mins Ages 5-10 Indoor

A playful, screen-free adventure designed to spark curiosity, sensory exploration, and fine motor skills for kids aged 5 to 10.

Materials Needed

  • • Identical glass tumblers or stemmed water glasses (6 units)
  • • Liquid food coloring (red, yellow, blue, green) (1 set)
  • • Wooden chopstick or light wooden dowel striker (1 unit)
  • • Measuring cup and tap water (1 set)

Pro Tips

  • → Fill glasses with measured graduating amounts of water (50ml, 100ml, 150ml, 200ml, 250ml).
  • → Tapping the glass rim causes the glass wall and water column to vibrate: more water slows vibration, creating a lower musical note.
  • → Tint each glass with a drop of rainbow food coloring to create a visually tuned musical instrument.

Safety First

Supervise glass tapping with care; tap lightly on cup rims, never strike with hard force.

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Step-by-Step Instructions

1

Step 1

Line up 6 identical glass cups in a row across a tabletop on a soft towel mat.

2

Step 2

Pour graduated amounts of water (50 mL, 100 mL, 150 mL, 200 mL, 250 mL, 300 mL) into the glasses.

3

Step 3

Add a drop of food coloring to each glass to make a rainbow visual musical scale.

4

Step 4

Tap each rim gently with a wooden chopstick, tuning water levels until you can play "Twinkle Twinkle Little Star".

What they are learning

Acoustic pitch & resonant mass vibration Musical scale frequency tuning Vibrational standing waves in liquid