Transfer of Heat

1
Heat Conducting Materials3rd grade

• SPI 0307.10.2 Classify materials according to
  their ability to conduct heat.

2
Thats hot!

• Many things give off heat.
• Heat is sometimes very hot!
• All heat is energy.

fire
Sun
electricity
3
Campfire!

• Pretend you are at a campfire. You are roasting a
  hot dog on a metal wire coat hanger.
• Slowly the end of the hanger warms up, as it
  takes in the heat from the fire.

4
Ouch!

• If you leave the hanger in the fire for a long
  time, the whole hanger will become to hot to
  touch!

• Why does this happen?

5
Heres the reason.

• This happens even though the handle end was
  never placed into the flames.
• Heat moves from the flames to the metal handle.
• From there it moves to all the molecules in the
  hanger by conduction until it reached your
  fingers.

6
Heat on the move!

• Heat can move from one object to another, or from
  one molecule to another through the process of
  conduction.

7
What is a molecule?
A molecule is like a tiny building block that
makes up everything around us. We cant see them
with our eyes.
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Hot All Over!

• As one molecule is heated it begins to move
  quickly.
• When it does it passes some of its heat energy to
  other molecules around it.
• When this happens, all the molecules of an object
  move heat from one to another, until they are all
  hot.

9
What things get hot fast?

• Some materials (objects) get warmer faster than
  others.
• Metal is a good conductor because it takes heat
  in quickly.
• Copper becomes hot quickly, so it is a conductor.

Copper pots
10
Youre no good!

• Other things like wood, plastics, and cotton are
  not good conductors of heat energy.
• These are called insulators.

11
Color conductors!

• Some colors are good conductors of heat!
• Black, navy blue, and other dark colors take in
  heat quickly.

12
Its getting hot in here!

• Have you ever noticed how quickly you get hot
  when you are wearing a black t-shirt on a summer
  day?

13
Cool colors?!

• Wearing white or light colored clothing outside
  helps you stay cool on hot days!

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HONK! HONK! BEEP! BEEP!

• Would a white car or black car on a summer day be
  hotter?

Which do you think would be hotter to touch?
15
Did you choose

• black?
• If you did, you are right!

16
Which would you choose?
On a hot day, which side of the shirt would keep
you cool?
17
If you chose..
white
you are right!
18
Remember.

• Heat moves through objects.
• This is called conduction!

19
Conductors

• Some things hold heat in faster than others.
• Metal and copper are conductors.

20
Insulators

• Plastic, wood, and cotton are insulators!
• They do not let heat in quickly!
• These things are insulators.

21
Stay cool dude!

• The color black takes in heat faster than cooler
  colors like white!
• On a hot day, wear a white shirt and chill out!