Download AIM: What is Conduction?

Mr. Z’s
Introduction to HEAT unit
AIM: What is Conduction?
Describe how heat is transferred
through solids.
Distinguish between the terms
“insulator” and “conductor”
AIM: What is Conduction?
Conductor, Conduction, Insulator,
Conductor
What are the girls doing in this picture?
What do you think will happen to the wax?
Point #3
Point #3
Point #1
This is an all metal pot on a hot stove.
Do you think the handle will be hot?
Why?
Bunsen Burner, and a metal bar place near the flame.
The bar is made of million and million of what?
Molecules.
What happens to the bar as it is placed in the
It gets hot!
flame?
When heat is added to a molecule,
what does it do?
It begins to vibrate faster because of
the added kinetic energy!
This heat travels from one
molecule to the next!
The kinetic energy is LITERALLY
passed from one molecule to the
next until the entire “bar” is hot!
This is the process of CONDUCTION!
Heat Flow
Area of Lowest Heat
Area of Highest Heat
The bar literally gets hot one
molecule after the next. Each time
the molecule closest to the heat
source passes the heat energy to the
molecule next to it which has less
heat. That is the way heat moves!
Heat moves from an area of higher
concentration (or heat) to an area of
lesser heat!
AIM: What is Radiation
What did the Girl say “Ouch”?
Why did the wax at Point 3 heat up last?
Point #3
Point #3
Point #1
Why does the handle get hot?
AIM: What is radiation?
Why do you
think the
grate gets
hot in the
fireplace?
AIM: What is radiation?
AIM: What is Radiation
...the passage of energy (particularly
heat or electricity) through
something.
AIM: What is Conduction?
PROBLEM: We add a metal spoon
and a wooden spoon into a pot of
boiling water. Which one get
hotter?
The metal of the spoon is a better
conductor of heat then wood.
AIM: What is Conduction?
DEMO PROBLEM #1:
•We add boiling hot water (for tea)
into two cups.
•One is made of Styrofoam, and the
other is made of glass.
•Which cup feels hotter?
AIM: What is Conduction?
PROBLEM #2: We add boiling hot
water (for tea) into two cups. One
is made of Styrofoam, and the
other is made of glass. Which one
get hotter?
Styrofoam is a better insulator of
heat then glass. Glass is better
conductor of heat!
AIM: What is Conduction?
DEMO PROBLEM #2:
•We add boiling hot water (for tea)
into two cups.
•One is made of Styrofoam, and the
other is made of glass.
•We can record the temperature
every 5 minutes
•Which cup retain more of the heat?
AIM: What is Conduction?
Conductors vs. Insulators
•Conductors transfer heat well.
•All metals are good conductors of
heat
•Insulators do not transfer heat well.
•Name some good conductors?
•Name some good insulators.
AIM: What is Conduction?
Conductors vs. Insulators
•Why do we use an oven mitt?
•Why do we use wooden spoons?
•Why do we get hot coffee in special cups?
•Why are ice tray usually made of metal?
•Which way does the heat flow in an ice
tray?
AIM: What is Radiation
Why are these pots made out of the
material that they are made out of?
Why do you think we add insulation
to our homes?
AIM: What is radiation?
Class Activity:
W/S 6-6
AIM: What is radiation?
Homework:
INTERNET QUESTIONS