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May 16, 2022

Create Your Own Thermometer

Is it cold outside- or is it getting warmer? Gauge the temperature after creating your own thermometer!

How this uses STEM

  • Liquids contract and expand in reaction to temperature changes!


  • Jar with a cap
  • Water
  • Rubbing Alcohol
  • Food Coloring
  • Straw- clear, if possible
  • Clay or playdough
  • Pen, or other tool that will allow you to poke a hole through the cap


  1. Mix equal parts rubbing alcohol and water, to fill up about 1/4 of the jar.
  2. Add in a drop off food coloring to better see the water.
  3. Poke a hole through the cap of the jar, one big enough to fit a straw through it.
  4. Cover any air holes with the clay/playdough.
  5. Take the jar from room to room and watch how the jar documents temperature changes!
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