Create Your Own Thermometer

How this uses STEM

• Liquids contract and expand in reaction to temperature changes!

Materials:

• 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

Instructions:

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!