3B SCIENTIFIC PHYSICS U30010 Instructions D'utilisation page 4

• Connect the hemisphere with stopcock to a pump
and open the valve.
• Place the second hemisphere on the first one and
press the two of together.
• A second person starts the evacuation process.
• After a short time (depending on the pump's pump-
ing power) stop the pump, close the stopcock and
loosen the hose connection.
• Demonstrate the effect of atmospheric pressure by
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trying to pull the hemispheres apart.
• After completing the experiment ventilate the sphere
by opening the valve. Make sure you hold on to the
hemispheres to avoid any damage from them falling
down.
Additionally required:
1 Vacuum pump (e.g. vacuum hand-operated pump
U20500)
4