DIY Homemade Thermometer

I will be teaching you how to make a homemade thermometer that goes up when it's hot and down when it´s cold.

Supplies

• Rubbing Alcohol
• Water
• Play-do
• straw
• test tube
• Food coloring (preferably a dark color)

Step 1: Starting Off

Fill the Test tube with equal amounts of water and hand sanitizer. don´t fill it up more than halfway.

Step 2: Adding Some Color

Next fill your tube with food coloring, you want it to be dark so you can see it at the end.

Step 3: Making It Work

Next, you want to put the straw in the tube and then put the play-do around the straw at the opening of the tube, making sure it is air-tight.

Step 4: Testing Your Thermometer

Now test your thermometer by putting it into a cup of hot water, and watch as the alcohol displaces the air, moving up the straw. I used alcohol in the thermometer because alcohol expands more than water, creating a more noticeable effect.