Thermal / Heat
Energy
Conduction, Convection, and Radiation
• What is Thermal / Heat Energy?
• Do really cold things like ice have
thermal/ heat energy?
Write yes or no on your
white boards
Bill Nye Video
http://www.youtube.com/watch?v=f1eAOygDP
5s
Write in Your Foldable
• More Molecules = More
Thermal/ Heat Energy
• Which one has more Thermal/
Heat energy?
OR
WHY?
Heat can be transferred by 3 different
ways. What are they?
• Conduction
• Convection
• Radiation
Learning Goal
Conduction
• Conduction is the transfer of heat energy
when molecules touch other molecules
• Molecules are always moving
• Heat causes them to move faster
• When a heated molecule bumps into a
non-heated molecule, the non- heated
molecule becomes heated.
Add This to Your Foldable
• The heat was transferred from the
heated molecule to the non- heated
molecule
• Heat flows from warmer to cooler
• Thus, the non-heated molecule moves
faster and becomes heated
Add This to Your Foldable
36 sec to 2 mins
Activity 6
Turn to page 14 in your
student journals
Alternative Activity 6
• Does conduction only occur with
solids?
Write your response on
the white boards
Ice Water Experiment
• Conduction is the transfer of heat
energy through molecules
• Conduction can occur in solid, liquids,
or gases
•
•
•
•
•
•
Placing a skillet on a hot stove
Licking ice cream
Dropping a marshmallow into hot chocolate
An ice cube in a glass of water
Steam from corn on the cob
Pouring milk into coffee
What is the heat GOING
into?
• http://gtmmedia.discoveryeducation.com/videos/dsc/externalapplic
ations/accessible/simulationses/Explorations/Content/Resources/PS_4_2_3_Heat_Tran
sfer/flash/PS_4_2_3_Heat_Transfer.html
Review
• 4- I can teach conduction to 8th graders
• 3- I understand conduction and could get an A
on the next quiz
• 2- I understand conduction but I need more
examples
• 1- I’m starting to understanding conduction
• 0- I don’t understand conduction at all
How you do feel about
conduction?
Learning Goal
Convection
• Convection is the transfer of heat
energy through liquids and gases
• It occurs in a circular motion
• When heat is added to fluids, it
become less dense (less heavy)
• This causes it to rise
• As the fluids travel away from the
heat source, it starts to cool down
Add This to Your Foldable
• It becomes more dense (more heavy)
• The dense fluids begins to sink lower
• When it gets closer to the heat source,
the fluids start to heat up
• When heat is added to fluids, the
molecules become less dense (less
heavy)
• The cycle starts again
Add This to Your Foldable
Draw Me in Your Foldable
Convection Experiment
http://www.teachertube.com/viewVideo.php?video_id=160
336&title=Convection
Alternative Convection
Experiment
The center of the Earth is
very hot. Explain the
convection currents in this
picture
Story Time With Ms.
Weston
Was Goldilocks telling
the truth?
Turn to page 18 in your
Student Journals
• What is the variable that changes?
• Should we use the same amount of
oatmeal?
• What should we measure the Temperature
in?
Starting Temp ( C) Final Temp. (C )
Large Bowl
Medium Bowl
Small Bowl
Goldilocks Experiment
Was Goldilocks telling
the Truth?
Why was the large bowl too
cold and the small bowl too
hot? (think about conduction
and convection)
Conclusion
• 4- I can teach convection to 8th graders
• 3- I understand convection and could get an A
on the next quiz
• 2- I understand convection but I need more
examples
• 1- I’m starting to understanding convection
• 0- I don’t understand convection at all
How you do feel about
convection?
Learning Goal
Radiation
Radiation, Conduction,
Convection