Purpose:Show water pressure versus depth with an aneroid gauge.
Description:An L-shaped glass tube, connected to an aneroid gauge, is immersed in water. The pressure at any depth is indicated directly on the gauge. This enables students to see the pressure at any level.
Invite students to make predictions about the relationship between depth and pressure, and perhaps even sketch what they expect the graph of this relationship to look like. Then take a few data points and see what happens.