17 Science: Barometers


Barometers record air pressure, which is the weight of air pressing down on the Earth’s surface.


  • recycled small clear plastic bottle
  • bowl
  • 4 craft sticks
  • water
  • food coloring
  • 2 rubber bands
  • marker
  • EHA Barometer Sheet

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  • Rubber band 4 craft sticks to the outside of the plastic bottle. Make sure the ends of the pencils are even and stick out above the top of the bottle.
  • Half fill the bowl and the bottle with water. Add food coloring if desired.
  • Cover the mouth of the bottle with your hand then carefully turn it upside down and place it in the bowl.
  • Mark the water level in the bottle with a small piece of colored tape or a permanent marker.
  • Each morning and afternoon check the water level. Is it the same or is it above or below the mark on the bottle.
  • Record the data on the EHA Barometer Sheet
  • Compare morning and afternoon readings.
  • Compare different days.
  • Graph the data.



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