Differences between revisions 1 and 15 (spanning 14 versions)

Balls and Plate , 4A30.22

Location:

Cabinet: Thermodynamics Cabinet
Bay: (A3)
Shelf: #1

attachment:4A30-22_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
Two balls	[:ThermoCabinetBayA3: TD, A3, Shelf #1]	4A30.22
Burner	location	NA
Liquid Nitrogen	location	NA
Safety grove and glasses	location	NA

Setup:

Option A. Shrink or extended ball

Make sure you have the balls with two sizes, one is over and one is under the hole size, 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 smaller ball or put the larger ball in the liquid nitrogen, this will make the opposite situation from the previous.

Option B. Extended Hole

Make sure you have the balls with two sizes, one is over and one is under the hole size, 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 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:4A30-22_01a.jpg	attachment:4A30-22_02a.jpg
attachment other photos	attachment other photos

References:

[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]

[:ThermalProperties:Thermal Properties of Matter]

[:Demonstrations:Demonstrations]

[:Instructional:Home]

-  ⇤ ← Revision 1 as of 2009-09-23 16:30:08 → 
  Size: 1293
  Editor: srnarf
  Comment:
+   ← Revision 15 as of 2009-10-02 21:31:15 → ⇥
  Size: 2636
  Editor: srnarf
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 2:
-=  Balls and Plate , 4A30.21 =
+=  Balls and Plate , 4A30.22 =
 Line 9:
-(attachment photo showing the fully set up demonstration)
+attachment:4A30-22_01.jpg
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-||apparatus||ME, Bay B1, Shelf #2|| ||
||all other parts||ME, Bay B1, Shelf #2|| ||
||...||ME, Bay B1, Shelf #2|| ||
||Possible supplies that are needed||Rode and Tack Cabinet|| ||
||...|| In Lecture Halls|| ||
||...|| Stock Cabinet || ||
||...|| Stock Cabinet || ||
+||A brass plate with a hole||[:ThermoCabinetBayA3: TD, A3, Shelf #1]||<:> 4A30.22 ||
||Two balls||[:ThermoCabinetBayA3: TD, A3, Shelf #1]||<:> 4A30.22 ||
||Burner||location||<:> NA ||
||Liquid Nitrogen||location||<:> NA ||
||Safety grove and glasses||location||<:>NA ||
-Line 27:
+Line 25:
-. Make a Setup check list.
 1. ...
+Option A. Shrink or extended ball
 1. Make sure you have the balls with two sizes, one is over and one is under the hole size, the brass plate with hole in the middle, and the stand.
 1. Demonstrate to students that the smaller ball can get through the hole and the larger ball cannot. 
 1. Heat the smaller ball or put the larger ball in the liquid nitrogen, this will make the opposite situation from the previous.

Option B. Extended Hole

 1. Make sure you have the balls with two sizes, one is over and one is under the hole size, the brass plate with hole in the middle, and the stand.
 1. Demonstrate to students that the smaller ball can get through the hole and the larger ball cannot. 
 1. Heat the ball by the burner until you sure that the hole get larger than before.
 1. Demonstrate to students again, this time both balls should get through the hole.
-Line 31:
+Line 41:
-. List any Warnings....
 1. Demonstration may require practice.
+. Beware of the heated plate.
-Line 37:
+Line 46:
-Insert description of demonstration, how is the demonstration preformed.
+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 39:
+Line 48:
-||attachment other photos||attachment other photos||
+||attachment:4A30-22_01a.jpg||attachment:4A30-22_02a.jpg||
-Line 44:
+Line 53:
-. List any references
+. [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]
-Line 46:
+Line 55:
-[Insert a back link to main topic list]
+[:ThermalProperties:Thermal Properties of Matter]

fw: Diff for "BallsPlate"

Balls and Plate , 4A30.22