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.

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

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

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

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.

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.