What happens next?

How to build a barometer
Gather your materials.
To make a tin can barometer, you will need a tin can, a balloon, a rubber band, glue, two plastic straws or coffee stirrers, construction paper, and an index card. Most of these items should be easily found around the home.

Select from:
* Hold the index card down flat with a pen and use markers to write the barometer's name down. For a basic example: put the index card in the middle of the tin can.
* If you don't have a tin can, any container with a large-mouth (diameter of 1.5-2 inches), plastic or glass, will work for this barometer. A bottle with a narrow mouth will not work.
* For a tin can, you will need three large plastic baggies, two small bands, scissors, a pencil, a ruler , 3 jigs, and glue sticks. With scissors, cut two five gallon (274 ml) cans of soda.
* Draw a long tube sticking out of the base of the tin can. To create the spout, draw a long tube that extends along the bottom.
If you don't have a tin can, any container with a large-mouth (diameter of 1.5-2 inches), plastic or glass, will work for this barometer. A bottle with a narrow mouth will not work.