Table of Thermodynamics Demonstration

Thermodynamics Equipment List

Lecture Demonstrations

Balls and Plate , 4A30.22

Topic and Concept:

Location:

4A30-22_01.jpg

Abstract:

Insert description of apparatus, its component, what it is demonstrating.

Equipment

Location

ID Number

A brass plate with a hole

TD, A3, Shelf #1

4A30.22

Two balls

TD, A3, Shelf #1

4A30.22

Burner

location

NA

Liquid Nitrogen

location

NA

Safety glove and glasses

location

NA

Important Setup Notes:

Setup and Procedure:

  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.
  2. Have the liquid nitrogen in the holder. Option A. Shrink or extended ball
  3. Demonstrate to students that the smaller ball can get through the hole and the larger ball cannot.
  4. 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
  5. Demonstrate to students that the smaller ball can get through the hole and the larger ball cannot.
  6. Heat the ball by the burner until you sure that the hole get larger than before.
  7. Demonstrate to students again, this time both balls should get through the hole.

Cautions, Warnings, or Safety Concerns:

Discussion:

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. You have two options to show student by following.

4A30-22_01a.jpg

4A30-22_02a.jpg

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Videos:

References:

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