How to build a working barometer.

Last year during our 8th grade Physical Science class , the students build a sort-of fancy Barometer.  It didn’t work.  In fact, it just fell apart.

Here we are a year later and my two youngest daughters have been given a task to build a barometer.  Their teacher gave them the instructions to build it at home.   This is what they did.


  • A jug.  We used one that looks like moonshine came in it.
  • Balloon: free from our grocery store.
  • Rubber band:  All homeschooling moms have rubber bands.
  • Rubber Cement:  Leftover from last year’s experiment.
  • A straw
  • A small poster board
  • red marker

Step One:  Cut the neck off of the balloon.


Step two: Attach the balloon to the mouth of the jar and secure it with the rubber band.


Step three: Cut the tip of the straw at an angle, so that there is a sharp point.  To make this work, you must be able to do the facial expression as well.


Step four: Color the tip red. We don’t know why this is done, so just do it, ok?  Oh, the red on my daughter’s face is strawberries, not the marker.


Step five: Use the rubber cement to glue the straw to the balloon, with the point facing the wall.  Do not sniff the glue.


Step six: As the air pressure in the jug changes, the balloon will rise or fall, making the straw change its position. Mark a poster board with the days of the week and place a mark where the straw is pointing to on each day. The girls are marking each day twice, once in the morning and once in the evening, for two weeks.


Here is the result after just a few days.


If you need a barometer built, just ask a 2nd or 3rd grader to build one for you. You’ll have a greater success of it working. 😀

6 responses to “How to build a working barometer.

  1. That’s is just too cool!! =)

  2. We made a barometer once, and it sort of worked. I didn’t know you weren’t supposed to sniff the glue – maybe that’s wrong with The Goobers’ eye balls.

  3. I love the picture of your daughter cutting the straw!!!! She is too cute.

  4. Wow, what a neat experiment! I am booking marking this for a future science project.

  5. They are just so cute and the barometer is great. We made one last year that worked ok.

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