Atmospheric pressure and Magdeburg experiment set with manual pump

Function

Intended for experimental study, physics laboratory, conducting physics experiments and natural science on: Natural sciences. Earth and universe. Atmospheric Pressure. The Magdeburg hemispheres experiment and atmospheric pressure. What is meant by Magdeburg hemispheres. Reducing the internal pressure of the disks. Balancing the internal pressure of the disks with atmospheric pressure. Inflating a balloon, decreasing the external pressure, etc.