Heat Transfer:
Conduction
Convection
Radiation
I. Thermal Energy
A. HEAT (thermal energy) is produced from the motion of
molecules.
B. The amount of heat depends on how fast the molecules
move.
C. As molecules move FASTER, more heat is produced.
D. Temperature measures how fast (kinetic energy) the
molecules are moving.
Question
Why is Frosty melting
E. Heat always transfers from a
warmer to a cooler object.
II. Heat Transfer Methods:
1. Conductio
n
2. Convection
3. Radiation
During this video jot down any
important info you hear about
the 3 types of heat transfer.
http://www.teachertube.com/video/heat-transfer-164366
Conduction & Radiation
http://www.science4us.com/elementary-physical-science/energy/heatenergy/?unit=energy&demo=inthelab
Cooking with Heat Transfer
http://www.youtube.com/watch?v=QZavDQiiTyI
When you heat a metal strip at one
end, the heat travels to the other end.
As the metal is heated, the particles vibrate.
These vibrations pass thermal energy along the
metal causing it to heat up. This is called
Conduction.
A. Conduction
1. Heat transfers from one object to another object
through DIRECT CONTACT.
2. Occurs in SOLIDS.
EXAMPLE: Cooking on the stove
Conduction =
CONTACT
Examples of Conduction:
B. CONVECTION
1.
2.
3.
4.
Heat transfer in FLUIDS (liquids or gases)
Heat is transferred through CURRENTS .
Warm fluids RISE bc they’re less dense
Cooler fluids SINK bc they’re more dense.
Convection Current
Convection = VENTS
Convection Current
Cool fluids sink
Sink=more
dense
Rise= less
dense
Warm fluids rise
Convection current in boiling water
Water cools at
the surface
Hot water
rises
Cooler
water sinks
Examples of Convection:
1. boiling
water
2. lava lamp
4. heated air
3. hot air
balloon
Convection currents in nature
Convection currents in the atmosphere Convection currents cause the cooler
are responsible for our weather.
breezes you experience by a large
body of water.
Convection currents also cause the
movement of magma within the earth.
The third method of heat
How does heattransfer
energy get from the Sun
to the Earth?
RADIATION
C. Radiation
1. Heat transferred through space by
ELECTROMAGNETIC WAVES
2. Can occur in all states of matter , but
radiation does NOT require matter to
transfer thermal energy
3. Example: Solar radiation from the Sun
Radiation = RAYS
Examples of Radiation:
1. Heat from Sun
3. Infrared heat lamp
2. Cooking in a microwave
4. Heat from fire
Solar Radiation
How much of the sun’s radiation do we actually
REVIEW
CONDUCTION
• requires direct
contact
• occurs in solids
CONVECTION
• currents in fluids
•warm fluids
RISE
less
•cooler fluids
SINK
more
•Found in nature
RADIATION
•rays or waves
•major source: heat
from the sun
• does not require
matter
Animated Review:
https://www.wisc-online.com/learn/natural-science/earthscience/sce304/heat-transfer--conduction--convection--radiation
EXAMPLES OF ALL 3 TYPES OF HEAT TRANSFER:
To learn more visit these interactive websites!!
websites!!
Heat Transfer
http://www.pbslearningmedia.org/asset/lsps07_int_heattransfer/
Rags to Riches Review Game
http://www.quia.com/rr/544955.html
PRACTICE!! 
What type of heat transfer is involved?
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Heating a room with a fireplace
Egg cooking in a frying pan
Roof of a house becoming hot
Sun heating up pavement
Walking on hot sand
Warm air mass causing a weather change
Heating leftovers in a microwave
A hot air balloon taking flight
Picking up a hot cup of coffee
Drives continental drift (the spreading of
continents)
CHECK YOU ANSWERS!! 
1. Convection
2. Conduction
3. Radiation
4. Radiation
5. Conduction
6. Convection
7. Radiation
8. Convection
9. Conduction
10. Convection
1.
Which of the following is not a
method of heat transfer?
A.
Radiation
B.
Insulation
C.
Conduction
D.
Convection
2. In which of the following are
the particles closest together?
A.
Solid
B.
Liquid
C.
Gas
D.
Fluid
3.
How does heat energy reach
the Earth from the Sun?
A.
Radiation
B.
Conduction
C.
Convection
D.
Insulation
4.
Which is the best surface for
reflecting heat radiation?
A.
Shiny white
B.
Dull white
C.
Shiny black
D.
Dull black
5.
Which is the best surface for
absorbing heat radiation?
A.
Shiny white
B.
Dull white
C.
Shiny black
D.
Dull black