3B Scientific Ball with Ring User Manual
3B SCIENTIFIC® PHYSICS
Ball with Ring U8442500
Instruction Sheet
06/08 ALF
1 Bracket with hole
2 Ball on chain
3 Handle
1. Safety instructions
When working with naked flames there is a risk of
burns or other injuries!
• Always stand Bunsen burner on a fire-resistant
surface.
• Never leave the burner unattended.
• Do not allow inflammable objects to come near
the flame.
• Long hair must be tied back.
• Do not stand close to the flame.
• Never work above the flame.
• Do not touch the ball with your hands when it is
hot.
• Before putting the apparatus away, allow the
ball to cool.
2. Description
The ball with ring is used to demonstrate the thermal
expansion of solid bodies.
The apparatus consists of a U-shaped metal bracket
with a ring-shaped hole and a steel ball attached to a
handle by a chain. The ball can only pass through the
hole at room temperature. If it is heated, its thermal
expansion prevents it from passing through.
3. Technical data
Dimensions of the bracket: 40×50×40 mm3
Diameter of ball: 22 mm
Length of handle including rod: 225 mm approx.
Weight: 175 g aprox.
4. Experiment procedure
4.1 Heating with a Bunsen burner
Additional apparatus needed:
1 Bunsen burner
• First verify that the ball passes through the hole
in the bracket at room temperature.
• Hold the ball in the flame of the burner and heat
it.
• Carry out the hole-passing test.
1
4.2 Heating with boiling water
Additional apparatus needed:
1 Glass beaker
Boiling water
• First verify that the ball passes through the hole
in the bracket at room temperature.
• Immerse the ball in boiling water for about 30
seconds.
• Test whether the ball passes through the hole.
• Cool the ball in cold water and test again
whether the ball goes through the ring.
Elwe Didactic GmbH ▪ Steinfelsstr. 6 ▪ 08248 Klingenthal ▪ Germany ▪ www.elwedidactic.com
3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪ www.3bscientific.com
Subject to technical amendments
© Copyright 2008 3B Scientific GmbH
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