Who here knows how to make a barometer using everyday stuff?

Answer 1

Try the methods illustrated on these sites:

http://sln.fi.edu/weather/todo/barometer.html

http://starryskies.com/try_this/baro1.html

http://www.wikihow.com/Make-a-Simple-Weather-Barometer

Answer 2

I've pasted links below. They're both from a site I've found to do science projects with my kids (2nd and 4th grade). Hopefully they're not too simple for what you need :)