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• 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
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com • Technical amendments are possible
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)
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