How to Make a Barometer With Coke Bottles


When teaching elementary or middle school children about climate and weather patterns, it can be difficult to keep their attention during class by simply lecturing to them. One solution is to devise an interactive experiment that demonstrates one of the lessons first hand. For example, you can show your students how to measure air pressure by creating a handmade barometer out of a few materials from an average kitchen.

Things You'll Need

  • 2-liter Coke bottle
  • Glass cup
  • Food coloring
  • Tape
  • Marker
  • Fill up a glass cup with water.

  • Add three drops of food coloring into the water.

  • Place the tip of a 2-liter Coke bottle upside down into the glass. The colored water will fill up into the neck of the bottle.

  • Tape the bottle onto the glass.

  • Draw a line onto the bottle where the colored water line is.

  • Place the device outside. The level of the colored water will move up or down inside the Coke bottle when the air pressure outside changes.

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  • Photo Credit bottle image by tofuwarrior from
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