1. Heat Transfer NOTES

2. TOTAL energy of motion in molecules of a substance
Thermal Energy
TOTAL energy of motion in molecules of a substance
(therm=heat)

3. Average amount of energy in motion
Temperature
Average amount of energy in motion
* Measured with a thermometer

4. HEAT Energy Transfers…
from hotter object to COLDER object
Heat
hot
cold

5. 3 types of heat Transfer
1) Radiation: infrared (not visible) and FELT as heat, can be absorbed or emitted; example: the sun, heat from a fire, frying an egg. *Touch is NOT required!*
2) Conduction: transfer of heat by TOUCH, usually includes direct contact; example: when you touch a hot pot
3) Convection: transfer of heat by movement of molecules in a liquid/gas, no touch required, heat expands followed by cooling and contraction; example: typically how heat is transfered in the troposphere, water boiled in a pot, a convectoin (toaster) oven.

6. *Feel warmth on face from sun=
Radiation (infrared)
Examples:
*Feel warmth on face from sun=
solar radiation
* Warmth of a fire
* Heat off car engine

7. Conduction=touch * Touching hot light bulb * Hot sand on feet
Examples:
* Hot sand on feet
* Touching hot light bulb
* Touching metal on hot seatbelt
* Stove to pan handle
* Melting ice in hand

8. Convection
* Boiling in water
* Convection oven

9. LOOK AT ALL THREE:

10. Heat Transfer in the Troposphere
* 3.convection
1.RADIATION from the sun
* CONVECTION is the most dominant heat transfer in the troposphere with the help of winds
2.Energy reaches the surface and is absorbed = CONDUCTION, then bounces back (rises)

11. Type
Definition
Examples:
Radiation
Conduction
Convection