Homemade Thermometers

  • Clear plastic drinking straw, preferably a 0.2 inch diameter straw.
  • Metric ruler
  • Fine-tipped permanent marker
  • Clean narrow-necked, small bottle with lid. Travel size bottles like these available from Amazon work well. Washed empty food coloring or vanilla extract bottles work well too.
  • Rubbing alcohol
  • A few drops or red, blue, or green food coloring. Liquid food coloring works best.
  • Paper or cloth towels
  • Modeling clay. Air-dry clay works well. Ultra-light modeling clay is easy to model and clean.
  • Medicine dropper or syringe
  • Water
  • Small bowl
  • Ice cubes
  • Optional: Store-bought thermometer

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