Download Types of Heat Transfer

Types of Heat Transfer
1
Heat
• The movement of thermal energy from
one place to another due to a difference in
temperature.
• In other words, heat travels from a hot
area towards a cold area.
2
On page 7 of your Interactive
Notebook, draw the
demonstration with food
coloring and hot a cold water.
• In which beaker is the food coloring
spreading out the fastest?
• Why does the food coloring spread out
faster in one beaker than the other?
• Beneath your diagram, describe what
happened.
3
Radiation
• The movement of heat by invisible waves, so
one can feel the heat without touching the
object.
4
Convection
• Takes place in fluids such as liquids or air.
• Occurs when hot air or liquid rises and cold air
or liquid moves in to take its place.
5
Conduction
• Takes place when heat moves from one
area of an object to another area of the
object without the object itself moving.
6
Types of Heat Transfer
• Conduction
• Convection
• Radiation
7
8
Examples of conduction
• A spoon being heated up while in a bowl of
soup.
• A car engine heating up.
• Your butt warming up
the seat of your chair.
9
10
Which objects make good
conductors of heat?
• Metals
• Glass
11
Which objects make poor
conductors of heat?
• Styrofoam
• Wood
• Air and fluids
12
Examples of radiation
• Heat from the sun warming your body.
• Heat from a fire warming your hands.
13
14
Examples of convection
• Heating up a pot of soup.
• Warm air coming out of the vent in your house
and heating up your room.
15
16
Heat transfer animation
• http://www.wisconline.com/objects/index_tj.asp?objid=SC
E304
17
Since heat moves from place to
place, heat in the atmosphere
moves around on the Earth.
This causes changes in
weather.
18
19
Convection currents
20
Ever notice how it is hotter upstairs
than downstairs?
Ever wonder why hot air balloons
float?
It is because hot air rises.
21
22
Convection in our atmosphere
23
Radiation
24
Exit Ticket-Heating the Atmosphere
A.
B.
C.
Adapted from: Prentice Hall: Science Explorer, Weather and Climate
25