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I1-11. Thermal Expansion - Ball And Hole
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I1-11. Thermal Expansion - Ball And Hole
Purpose
To illustrate thermal expansion in a paradoxical way.
Equipment
Metal ball and hole on handles, burner with matches.
Suggestions
Before performing the experiment ask your students: When the plate is heated, will the hole get bigger, smaller, or stay the same size? Many people misinterpret the idea of expansion to believe that the plate will expand inward, making the hole smaller.
Images
Description
At room temperature the ball will not fit through the hole in the metal plate. When the plate is heated by a burner for about 30 seconds, the ball easily fits through the hole.
References
Lecture Demonstration Apparatus Diagram. Paul Hewitt, Expansion of Nothing.
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See pagesi1. thermal properties of matter
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See pagesi2. transfer of heat
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See pagesi3. gases
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See pagesi4. changes of state
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See pagesi5. laws of thermodynamics
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See pagesi1. thermal properties of matter
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See pagesi2. transfer of heat
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See pagesi3. gases
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See pagesi4. changes of state
-
See pagesi5. laws of thermodynamics
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Physics Lab Demos