3B Scientific Baroscope User Manual

3B SCIENTIFIC® PHYSICS

U21853 Baroscope

Instruction sheet

7/03 ALF

®

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The baroscope is used to demonstrate the effect of buoy­ancy on an object in air.

1. Safety instructions

• Check the vacuum bell jar for damage before con­ducting the experiment.

• Defective vacuum bell jars can result in implosions.

1 Base

2 Stand rod with pivot

3 Styrofoam sphere

4 Balance beam

5 Counterweight

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 buoy­ancy.

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

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

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

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