Needed:
- Brass Ball and Hoop Model
- Blow Torch or open flame capable of 300 degrees Fahrenheit
The premise of this demonstrator is that the brass ball before being heated fits perfectly through the hoop; after it is heated, the brass ball expands and gets stuck in the hoop. This demonstrator is a helpful visual when proving thermal expansion and the effect of heating a metal.
Thermal Expansion of Liquid Water in a Bottle:
Needed:
- Water bottle with dyed water
- Thin plastic tubing
- Heat lamp
The water bottle will need a small hole punctured in the lid that is big enough for the tubing (or straw, if you choose) to fit through; the water will also need to be dyed to heighten the visual effect. The premise is that when the tube is inserted into the water bottle and the entire apparatus is placed underneath a heat lamp, the water will expand with the addition of heat and can be observed climbing up the inside of the tube or straw used. The climbing of the water proves that the water is expanding with the heat from the heat lamp.
Thermal Expansion Demo on an Atomic Level
Needed:
- Styrofoam Balls (8)
- Springs (12)
This demonstration is a model on an atomic level of how thermal expansion works. The balls and springs will be assembled into a cube to mimic a crystal lattice. The cube will then be "stretched" to show how, when heat or energy is added, the atomic structure expands, causing an increase in area or volume.
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