Caterpillar Silk-Cocoon Thermal Insulation Test

45 mins Ages 7-9 Indoor

An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 7 to 9.

Materials Needed

  • • Small glass baby food jars or spice jars (3 units)
  • • Thermometer (candy or scientific probe) (1 unit)
  • • Cotton balls (silk cocoon simulation) (15 units)
  • • Aluminum foil (1 sheet)
  • • Warm water (2 cups)
  • • Rubber bands (3 units)

Pro Tips

  • → Wrap one jar in cotton (mimicking caterpillar silk), one in aluminum foil, and leave the third jar bare as the control.
  • → Fill all three jars with water at the exact same initial temperature.
  • → Plot a line graph showing water temperature cooling curves over 30 minutes.

Safety First

Adult monitors warm water pouring; ensure water is approximately 45°C (not boiling).

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Step-by-Step Instructions

1

Step 1

Wrap jar 1 in a thick layer of cotton balls, wrap jar 2 in aluminum foil, and leave jar 3 bare as an uninsulated control.

2

Step 2

Fill all three jars with equal amounts of warm water (approx. 45°C) and record their starting temperatures.

3

Step 3

Measure and record the water temperature in each jar every 10 minutes over a half-hour period.

4

Step 4

Plot the temperature decline on graph paper and discuss how insects use air pockets in silk to survive freezing winters.

What they are learning

Thermodynamic heat retention Comparative biological insulation efficacy Fourier’s Law of thermal conduction