Barometers

In the sixth grade science, we just wrapped up out chapter on the atmosphere.  As part of that chapter, we focused on altitude, density of air, and air pressure.  We learned that a barometer can be used to measure the air pressure.  Students worked in small groups to build a model mercury barometer.  They used a 1 liter bottle, water, a pipet, and clay.  Students filled the bottle half way with water and put the pipet in enough to touch the water, but not the bottom of the bottle.  Then they secured the pipet while plugging the bottle with clay.  To simulate air pressure, students lightly squeezed the bottle.  As they did, the water level rose just like the mercury would in a barometer.