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Heat in the Atmosphere

Heat in the Atmosphere: Conduction, Convection, Radiation class notes for EMS 8th Grade Science class.
by

Ryan Hough

on 13 April 2015

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Transcript of Heat in the Atmosphere

Identify each of the following pictures as:

Conduction

Convection

Radiation

What kind of energy conversion happens in a computer monitor?

a. Light energy is converted into electrical energy.

b. Chemical energy is converted into light energy.

c. Electrical energy is converted into light energy.

d. Light energy is converted into chemical energy.

Heat In the Atmosphere

What would happen to the earth’s temperature as a result of a reduction of the ozone layer?

Think about this…

In which of these situations can heat be transferred through radiation?

a. In empty space

b. Only when matter is present

c. Only when objects are touching

d. Between objects at the same temperature

A student is holding an ice cube in her hand. Which of the following describes the energy transfer that will most likely occur?

a. Energy will move by convection from the ice to her hand.

b. Energy will move by convection within the ice.

c. Energy will move by conduction from her hand to the ice.

d. Energy will move by radiation from her hand to the ice and vice versa.

Greenhouse Effect

Convection is the transfer of heat energy in a liquid or gas through the motion of liquid or gas caused by differences in density.
Ex. Hot water

Convection

Heat energy enters and moves through the atmosphere in three different ways:

Radiation
Conduction
Convection

How Heat Energy Moves:

Energy from the sun heats the atmosphere and Earth’s surface.

This heat spreads throughout the atmosphere and is also radiated back into space.

Key Idea

What would happen to the earth’s temperature as a result of an increase in the greenhouse effect?

What about this…

What would happen if the global cloud cover would increase?

Think about this…

What would happen to earth’s temperature after a major volcanic eruption?

Think about this…

Conduction is the transfer of heat energy through collisions of the atoms or molecules of a substance.
Ex. Walking barefoot on hot ground.

Conduction

Radiation is the transfer of energy through space in the form of visible light, ultraviolet rays, and other types of electromagnetic waves.

Radiation

The sun:
gives off radiant energy.
The atmosphere absorbs some of this but most passes through it.
The earth’s surface absorbs this then re-radiates it as heat



Sources of energy to warm the atmosphere:

Warm air-
fast
moving molecules.

Cold air- slow moving molecules.

Definition: Measure of average kinetic energy of molecules

Temperature

The Greenhouse Effect
The marshmallows in this picture
The air in this picture
The metal rod
Time for a fun review of heat transfer in the atmosphere
Try this one... (no really try it! Take off your shoe and put your foot on the floor.
Why is this dude getting a suntan?
Check for understanding
Full transcript