Transcript 3 ways that heat can be transferred

Heat Transfer
• I can explain how heat is transferred
through convection, conduction, and
radiation.
• I can give examples of how convection,
conduction, and radiation occur every
day in the real world.
3 ways that heat can be transferred
• The sun can heat
things in 3 different
ways.
• Reading: Class notes
Heat Transfer Song
Conduction
• Heat is transferred through
direct contact (touch).
• Heat travels from the
warmer object to the cooler
object
• Examples: touching a stove
and being burned, ice
cooling down in your hand
Radiation
• Heat is transferred
through space in the form
of waves.
• Examples: Sun rays, a
campfire, an open oven
door, heat from a light
bulb
Convection
• Heat transfer through liquids or
gases as particle circulate (rise and
fall).
• Warmer areas of a liquid or gas rise
(less dense) and then sink down
when they get colder (more dense).
• Creates a circle, because of density
differences
• Example: convection currents,
water boiling in circles in a pot,
greenhouse
Check for Understanding: Question
In your notebooks answer the
following question:
1. Where in this
picture do you see
radiation?
2. Where do you see
convection?
3. Where do you see
conduction?
Check for Understanding: Answer
Heat Transfer Practice
• Directions: For each picture, show the correct
sign when I count to 3. Do not put up sign
before I count!
– Convection: Hands in Shape of Circle (shape
of convection movement)
– Conduction: Hand to ear (directly touching
ear)
– Radiation: Hands in front (as if feeling heat
from stove/campfire)
Example #1
• How the inside of
a greenhouse
works.
Example #2
A pan sitting on a
hot burner.
Example #3
• Touching a metal
spoon that is
sitting in a pot of
hot soup
Example #4
• A person placing
their cold hands
over a warm fire
Example #5
• Using a heating
blanket to get
warm
Example #6
• Macaroni rising and
falling in a pot of boiling
water
Example #7
• A person placing
their hand over a
hot burner
Example #8
• Putting your wet shoes
on a floor vent to dry
them faster
Heat Transfer Tree Map
Types of
Heat Transfer
Conduction
Convection
Radiation
Definition
Definition
Definition
Example
Example
Example
Picture
Picture
Picture
Heat Transfer Lab Demonstration
• Station 1: Beads
– How to increase or decrease boiling.
– Do not touch beaker!
• Station 2: Ice
– Hold ice for long enough to melt.
• Station 3: Lamp
– How to use a thermometer demonstration.
Heat Transfer Lab
• Work with ALL group members
• Fill in your lab sheet during each station
time.
– Answer all lettered questions in the
observation column
• When finished, fill out heat transfer
classification worksheet independently.