3B Scientific Baroscope - Manual (Page 2)

2
Instruction sheet
3B SCIENTIFIC® PHYSICS
U21853 Baroscope
7/03 ALF
®
The baroscope is used to demonstrate the effect of buoy-
ancy on an object in air.
1. Safety instructions
• Check the vacuum bell jar for damage before con-
ducting the experiment.
• Defective vacuum bell jars can result in implosions.
2. Description, technical data
The baroscope consists of a balance beam mounted on
a metal base on whose cross balance beam a styrofoam
sphere is suspended from an eyelet. At the other end of
the balance beam there an adjustable counterweight to
establish equilibrium.
Styrofoam sphere: 50 mm Ø
Base: 120 mm x 90 mm
Height: 125 mm
3. Operation
• Place the baroscope on a vacuum experiment plate.
• Adjust the balance beam so that it is in a state of
equilibrium under atmospheric pressure.
• Cover it with the vacuum bell jar and evacuate the
chamber.
• Styrofoam sphere falls due to the drop in air buoy-
ancy.
Additionally required:
1 Chamber e.g.
Vacuum experiment plate U21850
and vacuum bell jar U21851
1 Vacuum pump e.g.
Membrane pump U14502 or
Vacuum hand-operated U20500 or
Water-jet pump U16050
1 Vacuum hose e.g. U10140
1 Base
2 Stand rod with pivot
3 Styrofoam sphere
4 Balance beam
5 Counterweight
2
3
1
4
5
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com • Technical amendments are possible