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Homemade Thermometer

Supplies Needed:

Plastic Bottle (soda or water)

Clear Straw (plastic)


Rubbing Alcohol

Clay or Playdough


#1: Fill half the bottle with rubbing alcohol

#2: Fill the rest of the bottle with water

#3: Add a few drops of food coloring and shake the bottle to mix up the color

#4: Place the straw in the bottle

#5: Place the clay around the rim of the bottle to hold the straw about ¼ inch from the bottom of the bottle.

#6: You are now ready to use your thermometer. You can place it in cold and warm places to see the liquid rise and lower on the straw.


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