1. Conduction, Convection, and Radiation
Heat Transfer
Conduction, Convection, and Radiation

2. Basic Guidelines – Heat and Particle Movement Relationship

3. Heat and Temperature Animated
This simple animation shows what happens to these spheres (blue and yellow) when the temperature moves from 0 degrees Kelvin to 300 degrees Kelvin.
Note the speed of the smaller (yellow) particles increases faster than the larger (blue) ones.

4. Heat Transfer
Heat transfer is the movement of thermal energy from a warmer item to a cooler item.
Remember, heat moves in predictable ways, from a high to a low.

5. Three Heat Transfer Situations
Conduction
Convection
Radiation

6. Conduction Conduction is heat transfer by contact. (Solids) Examples:
Your feet transfer (conduct) heat to a cold tile floor
A spoon placed in hot soup becomes warmer as the spoon conducts heat away from the hot soup

7. Conduction examples

8. Convection Convection transfer by circulation (fluid)
A fluid is defined as a liquid or gas because fluids have the ability to flow from one place to another
Solids, however, maintain their position

9. Convection continued
Consider this - when you look at the road in the summertime on a hot day, you may notice that the air above the road looks “blurry” – this is convection taking place as the hot air directly over the road absorbs the heat from the road and rises. Although the explanation can be quite complex, convection can help explain why mirages are seen in the desert.

11. Convection and Earth Science Connection

12. Radiation
Question: If conduction deals with solids and convection deals with liquids, how does heat arrive to Earth from the Sun?
There is very little matter in between the Earth and Sun.

13. Radiation Diagram

14. Radiation continued
Heat can travel in waves without a medium (a liquid, solid, or gas).
Radiation is the term that describes heat movement without a medium of matter.

15. The Electromagnetic Spectrum

16. Radiation continued
All of the forms of electromagnetic energy in the spectrum can travel through the universe as waves or particles called photons – we call this radiation.

17. Practical Applications
Discuss and explain how potholes are formed
Describe how a hot air balloon works