physics heat transfer Flashcards
(10 cards)
What are the three ways heat can be transferred?
- Conduction
- Convection
- Radiation
Define conduction.
Conduction of heat is the process by which heat is transferred along a stationary solid material, with heated particles remaining in their position.
What materials are known as good conductors of heat?
Most metals such as:
* Copper
* Aluminum
* Silver
* Iron
What materials are considered poor conductors of heat or insulators?
Most non-metals such as:
* Air
* Wood
* Plastic
* Cloth
* Cotton wool
* Cork
What is thermal conductivity?
The ability of a material to conduct heat.
How does the kinetic molecular theory explain conduction?
When one end of a material is heated, molecules gain energy and vibrate faster, transferring energy to neighboring molecules, which continues along the solid.
What is the thermal conductivity of liquids generally like?
Liquids are poor conductors of heat, with the exception of mercury.
Describe an experiment that demonstrates that water is a poor conductor of heat.
A piece of ice wrapped in metal gauze is placed in a test-tube full of water, and when heat is applied, the ice does not melt for some time despite boiling water above.
What are the applications of good conductors?
Good conductors are used in:
* Cooking pots
* Frying pans
Fill in the blank: The ability of a material to conduct heat is known as its _______.
[thermal conductivity]
