Ball and Ring, 4A30.21

Location:

• Cabinet: Thermodynamics Cabinet

• Bay: (A3)

• Shelf: #1

attachment:4A30-21_01.jpg

Description:

Two set of a brass ring and a brass ball.

Setup:

1. Make sure that you have all of the apparatuses in table above.
2. Install the burner gas tube with the gas source.
3. Make sure that you have the gas switch off and in the right pressure that you want before you turn it on.
4. Heat the ball from the set that a ball can get through a ring.
5. Put the ring from the set that a ball cannot get through a ring on the liquid nitrogen holder.

Cautions, Warnings, or Safety Concerns:

1. Wear the safety glove and glasses.
2. Beware of the heated ring and the cooled ring.

Demonstration:

The extended ball demonstrates the thermal expansion property of the material. And the shrink ring demonstrates the opposite effect of thermal expansion property. You can show the students two ways.

1 : Extended ball

1. First demonstrate to student that the ball is smaller than the ring. So, it can get through the ring.
2. Heat the ball until it expands. Demonstrate to student, this time the ball is larger than the ring. So, it cannot get through the ring.

2 : Shrink ring

1. First demonstrate to student that the ring is larger than the ball. So, the ball can get through the ring.
2. Put the ring in the liquid nitrogen until you are sure that it shrinks. Demonstrate to student, this time the ring is smaller than the ball. So, it cannot get through the ring.

References:

1. List any references

[:ThermalProperties:Thermal Properties of Matter]

[:Demonstrations:Demonstrations]

[:Instructional:Home]