In the first experiment a water column is held by atmospheric
pressure alone. The pressure of the water column is calculated with
the formula for the hydrostatic pressure.
In the second experiment the atmospheric pressure is determined
using a vacuum. The pressure needed to maintain the vacuum
corresponds to the atmospheric pressure.
By comparing the hydrostatic pressure of the water column from
the first experiment with the atmospheric pressure from the second
experiment the difference in size becomes clear and therefore also
quantitatively displayed why the first experiment works.
Simple and clear setup
Achievement of an elemental learning objective with little