1. Heat Energy Transfers Three Ways

2. HEAT is ENERGY. It can transfer (move) and change.

3. Heat causes Temperature!
Heat energy can make atoms move.
HEAT

4. Heat causes Temperature!
Heat energy can make atoms move. Heat energy is measured in units called Joules (J).

5. Heat causes Temperature!
Heat energy can make atoms move. Heat energy is measured in units called Joules (J). The motion of molecules is known as temperature.

6. Heat causes Temperature!
Heat energy can make atoms move. Heat energy is measured in units called Joules (J). The motion of molecules is known as temperature. Temperature is measured as: Celsius (oC) or Fahrenheit (oF) or Kelvin (K).

7. According to Pg. 13 of the ESRT, what temperature does water boil in oC?

8. MATERIALS CHANGE TEMPERATURE DIFFERENTLY
This is specific heat.
Temp. changes slowly
(needs MORE heat)
Which changes temperature SLOWER?
Temp. changes quickly
(needs LESS heat)

9. Why does the sand at the beach get hotter than the water on a summer day?
(1) Sand is higher density
(2) Sand is lighter in color
(3) Sand has a low specific heat
(4) Sand is solid, causing greater
concentrations of energy.

10. What changes temperature faster, the pot or the water?
4.18 J/g.Co
.45 J/g.Co
BTW…why is the handle a different material?
About ten times faster.
THE POT

11. The metal pot transfers the heat quickly (it CONDUCTS).
The plastic handle doesn’t transfer heat (it INSULATES).

12. 1. Conduction – Energy transfer by the
collision/vibration of molecules.
Low Specific Heat = Conductor
High Specific Heat = Insulator

13. A material is a good conductor of thermal energy if it has a
1) High Specific Heat 3) High temperatures
2) Low temperatures
4) Low Specific Heat

14. HEAT may be transferred two other ways…

15. 2. Convection – energy transfer through
density changes in a fluid.
Cool makes fluid contract, become more dense, and sink
Heat makes fluid expand, become less dense, and rise

16. 2. Convection – energy transfer through
density changes in a fluid.

17. 2. Convection – energy transfer through
density changes in a fluid.

18. 3. Radiation - Energy transfer by waves

19. 3. Radiation - Energy transfer by waves

20. Contact with moving atoms2) 1)
Density changes 3)
Waves through
space