2. It is the form of energy that could be transfer
from one system to another.
Heat is never contained in a body.
Associated with the motion of molecules.
3. .
Heat transfer is the exchange of thermal
energy between physical systems.
Temperature difference is its driving force.
Always occur from higher temperature region
to lower temperature region.
5. Transfer of heat through direct contact.
Without any appreciable motion of
molecules.
Heat flows as a result of temperature
gradient.
From high temperature region to low
temperature region.
8. Some materials conduct heat better than others.
Materials that transfer heat well are called
conductors.
Metals are usually good conductors.
Wood, paper and plastic are not.
Materials that stop the transfer of heat are called
insulators (styrofoam, wool, fiberglass).
10. 1. When you heat a metal pan at the bottom, the
heat travels to the other end.
As you heat the metal, the particles vibrate, these
vibrations make the adjacent particles vibrate, and so on
and so on, the vibrations are passed along the metal and
so is the heat, since it’s a metal heat will also by the
transport of electron within the boundary of metal pan.
11. Example 2
The metal conducts heat from the cup
of warm water to the cup of cool water.
12. Your Coke becomes cold because the heat from the soda
transfers into the ice, not the other way around.
Example 3
13. Convection
• Heat transfer by convection is the transfer of
heat through the fluid (liquids and gases)
movement of currents.
21. No need of material or medium
to propagate.
Example
22. This picture illustrates all three type of heat transfer.
Can you identify them all?
Conduction
Radiation
Convection
23. In nuclear power stations
Fast dissipation of heat in engines(Fins)
Heat transfer through composite walls
Architecture.
Heat exchangers.
Cooling techniques.
