Homemade Thermometer

Clear plastic bottle.
Rubbing alcohol.
Water.
Food coloring.
Clear plastic straw.
Modeling clay.
Permanent marker..Build Thermometer: Fill the plastic bottle with a mixture of equal parts rubbing alcohol and water. Add a few drops of food coloring.
Insert Straw: Place a clear plastic straw in the bottle, securing it with modeling clay to seal the bottle.
Calibrate: Mark the level of the liquid in the straw with a permanent marker as the starting point.
Measure Temperature: Place the thermometer in different environments (e.g., warm water, cold water) and observe the changes in liquid level.
Record Observations: Record the temperature readings and the corresponding liquid levels.
Discussion: Discuss how thermometers measure temperature and their real-world applications.