Physics Dept. Demonstration Manual

DHS08 - Suction Cups, Air Pressure


To illustrate atmospheric pressure.

  • Magdeburg Pressure discs
  • Vacuum pump and plate


When the air space between the two discs has been exhausted, the stopcock closed, and the device removed from the pump plate, it will be impossible to pull the plates apart by hand. If the stopcock is opened, they separate easily.