Transcript Radiation, Conduction, Convection

Radiation, Conduction,
Convection
Heat Transfer Processes
Radiation
1. _____________
Sun heats Earth’s
surface in the
form of rays or
waves
Conduction 2. _____________
Earth’s warm
surface heats
lower atmosphere
by direct contact
3. _____________
Convection heat is distributed
by warm air rising
and cold air
sinking
Radiation
•The transfer of heat energy by electromagnetic radiation.
Solar energy reaches Earth by radiation.
•Earth is heated by this process.
•various substances on earth (dirt, rocks, water, concrete,
sand, etc.) absorb this energy and their heat level is raised.
Conduction
• The transfer of heat energy from one substance to
another through contact.
• The air touching the Earth’s surface is heated due
to conduction.
Convection
• The transfer of heat energy through a circular motion of a
fluid.
• Commonly seen in the kitchen when you see boiling water
• Air in the atmosphere acts a fluid
Questions
If you feel the heat in the handle of a cooking
pot, that heat was transferred to the handle by:
A.) Convection
B.) Conduction
C.) Radiation
Answer: Conduction
Questions
A sunburn is caused by which method of heat
transfer:
A.) Radiation
B.) Convection
C.) Conduction
D.) Visible Light
Answer: Radiation
Transfer of Heat Energy
Summary
1.Radiation
2.Conduction
3.Convection
3 Ways heat is transferred into the
atmosphere…
1.Radiation
2.Conduction
3.Convection
Greenhouse Effect
The heat
greenhouse
effect
is convection
the rise in temperature
Prevents
loss mainly
from
(air movement
thataway
the Earth
experiences because certain gases
carrying
the heat)
in the atmosphere (water vapor, carbon dioxide,
nitrous oxide, and methane, for example) trap
energy from the sun. Without these gases, heat
would escape back into space and Earth’s
average temperature would be about 60ºF colder.
Because of how they warm our world, these
gases are referred to as greenhouse gases.