My School Barometer

I have a barometer at school that just measures if the air pressure goes up or down.  It is often the center of conservation in my room.  I have a lot of things in my room to make kids think and ask questions.

This is how it works:  when the air pressure is low, the colored water goes up the small tube.

When the air pressure is high, the colored water is pushed back down the small tube in the larger tube.

Last Thursday the water was at the top of the small tube for most of the day.  It even spilled over over several times.  We had a good time talking about air pressure and how it relates to rain on and off all day long.