thermal / heat energy

Thermal / Heat EnergyConduction, Convection, and Radiation

•What is Thermal / Heat Energy?

Write yes or no on your white boards

• Do really cold things like ice have thermal/ heat energy?

Bill Nye Videohttp://www.youtube.com/watch?v=f1eAOygDP5s

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

Conduction

Learning Goal

Add This to Your Foldable

• 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

36 sec to 2 mins

Activity 6

Turn to page 14 in your student

journals

Alternative Activity 6

Write your response on the white boards

• Does conduction only occur with solids?

Ice Water Experiment

• Conduction is the transfer of heat energy through molecules• Conduction can occur in solid, liquids,

or gases

What is the heat GOING into?

• 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

Review

• http://gtm-media.discoveryeducation.com/videos/dsc/externalapplications/accessible/simulations-es/Explorations/Content/Resources/PS_4_2_3_Heat_Transfer/flash/PS_4_2_3_Heat_Transfer.html

How you do feel about conduction?

• 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

Convection

Learning Goal

Add This to Your Foldable

• 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

Draw Me in Your Foldable

Convection Experiment

Alternative Convection Experiment

http://www.teachertube.com/viewVideo.php?video_id=160336&title=Convection

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

Goldilocks Experiment

• 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

Was Goldilocks telling the Truth?

Why was the large bowl too cold and the small bowl too hot? (think about conduction and convection)

Conclusion

How you do feel about convection?

• 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

Radiation

Learning Goal

Radiation, Conduction, Convection