How Can You Build a Quick, Easy Barometer?

I did this blindly–not really knowing if it would work. I was in search of interesting weather activities and thought I could make this barometer work. When the air pressure is high the arrow points above the middle mark. When the pressure is low the straw points below the middle mark. Here’s the one I made at home. The best thing is that it really works!!!!

A few easy materials:

1.jar

2. rubber band

3. balloon

4. straw

5, tape

6. paper/index card

7. ruler ( and/or grid paper)

8. tape

After I built this I had my doubts about it working. I build one at home first. Get a jar (larger jars are better but I used baby food jars because I had some on hand). Snip off the bottom part of a balloon so that you have a wider surface to stretch latex over the mouth of a jar. Get the balloon as smooth as possible across the lid and put a rubber band around the balloon to seal in the air as tightly as possible.

Here’s the barometer I made at school.

Some places say that you should use double sided tape to attach the straw, but I used regular Scotch tape, and it worked fine. Cut the end of the stew into a pointed shape so that it works as a pointer towards the marked paper. You can incorporate measurement and be as precise about it as you like. With the barometer I made at home I just build the barometer and put a mark where the stars was pointing after I first built it. Then I put another mark about a cm above and below the initial mark. I found mm graph paper online as a free download and used that at school. This makes for a great measurement discussion. Enjoy building your very own barometer!