Magdeburg Plates
012–07190B
2
Before the vacuum is pulled, the pressure of the air inside the plates equals the
pressure outside the plates (Figure 1a).
After the vacuum is pulled, the plates are held together with a force equal to the
total pressure outside the plates minus the residual pressure inside the plates after
the removal of air with the vacuum pump (Figure 1b).
Figure 1
(a) When no vacuum exists
inside the plates, the force
of atmospheric pressure
against the outside of the
plate equals the force
pushing from the inside.
(b) When a vacuum has
been created in the interior
chamber, the force holding
the plates together is equal
to the atmospheric
pressure
a
b
Note:
Approximately 610 Newtons (137 pounds) of force are required to pull
the plates apart when the large O-ring is used.
Theory
Additional Suggested:
• Magdeburg Plate Accessories (SE-9718)
• Pressure Sensor (CI-6532 or CI-6533)
[Do not use with CI-6534 Low Pressure or CI-6559 Humidity Sensor]
•
ScienceWorkshop
Interface (300, 500, 700, or 750)
• computer and data acquisition software
(
ScienceWorkshop or DataStudio)
