| 2 |
Thermal Physics
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Where to go! |
| 2.3 |
Transfer of Thermal Energy
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A
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Conduction
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Section 1.8 page 140 |
| Core-1 |
Describe experiments to demonstrate the properties of good and bad conductors of heat |
p140 |
| Sup-1 |
Give simple molecular account of the heat transfer in solids |
p140 |
- Explain how heat is flows between two bodies?
Heat flows from high temperature to low temperature
- List three ways for transferring heat from on place to another?
- Conduction
- Convection
- Radiation
- What is meant by conduction?
Conduction is the process of transferring heat by the vibration of the object molecules
- How heat is transferred by conduction?
When we heat one end of a metal bar, the particles at this end will vibrate faster hitting adjacent particles and make them vibrate faster. In time, this process continues until all the particles at the other end vibrate faster.
- List some good conductors of heat.
All metals are good conductors of heat. Gold, Silver, Copper, Iron, lead, zinc, steel.
- List some poor conductors (insulators) of heat.
All gases, glass, plastic, rubber, wood, polystyrene and materials with air trapped in the: aerated concrete, wool, glass wool, plastic foam, expanded polystyrene.
- Explain an experiment to demonstrate the properties of good and bad conductors of heat
| Bring different metals (for example steel, iron, aluminum, copper as shown) in the form of rods of equal size and coat each one with a thin layer of wax. Place the metals in a container that contains heated water at 100C and leave them for about 10 minutes. The rod that has the grater length of melted wax is considered the best conductor of heat. |
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