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Size: 1546
Comment:
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Size: 2099
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 9: | Line 9: |
| (attachment photo showing the fully set up demonstration) | attachment:4A30-21_01.jpg |
| Line 27: | Line 27: |
| 1. Demonstrate to students again, this time both of the balls can get through the hole. | 1. Demonstrate to students again, this time both of the balls should get through the hole. |
| Line 35: | Line 35: |
| When the plate is heated, it expands due to | When the plate is heated, it expands the hole in the middle of the plate. [The molecular bonds are lengthened, when the material expands. Try to think in this way, a group of people standing in a tight circle with elbows linked. Then they lengthen their "bonds" by moving to hold hands at arms length. They also have to expand the circle by standing back, while they all stand further apart. This is like the molecular bonds around the hole.] So the ball can get through it. |
| Line 37: | Line 37: |
| ||attachment other photos||attachment other photos|| | ||attachment:4A30-21_01a.jpg||attachment:4A30-21_02a.jpg|| |
| Line 42: | Line 42: |
| 1. List any references | 1. [http://wiki.answers.com/Q/When_a_block_with_a_hole_in_it_is_warmed_why_doesn%27t_the_material_around_the_hole_expand_into_the_hole_and_make_it_smaller Wikianswers] |
Balls and Plate , 4A30.22
Location:
Cabinet: Thermodynamics Cabinet
Bay: (A3)
Shelf: #1
attachment:4A30-21_01.jpg
Description:
Insert description of apparatus, its component, what it is demonstrating.
Equipment |
Location |
ID Number |
|
|
|
A brass plate with a hole |
[:ThermoCabinetBayA3: TD, A3, Shelf #1] |
4A30.22 |
A ball |
[:ThermoCabinetBayA3: TD, A3, Shelf #1] |
4A30.22 |
Burner |
location |
NA |
Safety grove and glasses |
location |
NA |
Setup:
- Make sure you have the balls with two sizes, the brass plate with hole in the middle, and the stand.
- Demonstrate to students that the smaller ball can get through the hole and the larger ball cannot.
- Heat the ball by the burner until you sure that the hole get larger than before.
- Demonstrate to students again, this time both of the balls should get through the hole.
Cautions, Warnings, or Safety Concerns:
- Beware of the heated plate.
Demonstration:
When the plate is heated, it expands the hole in the middle of the plate. [The molecular bonds are lengthened, when the material expands. Try to think in this way, a group of people standing in a tight circle with elbows linked. Then they lengthen their "bonds" by moving to hold hands at arms length. They also have to expand the circle by standing back, while they all stand further apart. This is like the molecular bonds around the hole.] So the ball can get through it.
attachment:4A30-21_01a.jpg |
attachment:4A30-21_02a.jpg |
attachment other photos |
attachment other photos |
References:
[:ThermalProperties:Thermal Properties of Matter]
[:Demonstrations:Demonstrations]
[:Instructional:Home]