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.

Supplies:

  • 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.

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

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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.

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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.

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

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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.

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Here is the result after just a few days.

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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. 😀

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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.
    Toni

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

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