1. Heat Energy
5th Grade

2. What is Thermal Energy Transfer?
There are three ways heat can move through a system:
Conduction: the transfer of thermal energy from one object directly into another ( ex: heat from the iron moves directly into the clothing).
An object is touching a hotter
object so, thermal energy will
flow from hotter object directly to the cooler object.

3. Conduction The molecules do not have to be the same substance.

4. The metal conducts heat from the cup
Example 1
The metal conducts heat from the cup
of warm water to the cup of cool water.

5. Your Coke becomes cold because the heat from the soda
Example 2
Your Coke becomes cold because the heat from the soda
transfers into the ice, not the other way around.

6. What is Thermal Energy Transfer?
There are three ways heat can move through a system:
Convection: the transfer of thermal energy through the movement of a gas or a liquid.
As a gas or liquid is heated, the heat causes it to move upward, carrying heat to the area above the heat source (heated air moves up, carrying thermal energy to the air above it)

7. Convection

8. The radiator warms the room by warming the
The radiator warms the room by warming the
air around it. Then the warm air transfers heat
to the rest of the room through convection.

9. Where is the freezer compartment put in a fridge?
Cold air sinks
Where is the freezer compartment put in a fridge?
Freezer compartment
It is warmer at the bottom, so this warmer air rises and a convection current is set up.
It is put at the top, because cool air sinks, so it cools the food on the way down.

10. Why is it windy at the seaside?

11. The third method of heat transfer
How does heat energy get from the Sun to the Earth?
There are no particles between the Sun and the Earth so it CANNOT travel by conduction or by convection.
RADIATION ?

12. What is Thermal Energy Transfer?
Radiation: the transfer of energy by waves that move through matter and space.
Solar Energy gives infrared waves. ( heat waves).
Not all radiation from the sun reaches Earth’s surface. Some of it is reflected back into space by the atmosphere.
Reflection occurs when heat or light bounces off an object.
Radiation carries thermal  energy from the lamp to the food.

13. The heat from the campfire transfers
into your marshmallow, giving you a yummy, gooey treat!
(Direct contact between the fire and your marshmallow will ruin it!)
Example 2

14. By the heat waves emitted from the fire
Directly from handle to hand
Through the movement of water
By the heat waves emitted from the fire

15. What are Insulators and Conductors?
Insulator: anything that slows the movement of thermal energy.
Examples include: coolers, foam cups, fur coat.
This slide includes a DE Science video clip about insulators and conductors.
The lunch bag prevents heat in the air from moving
Into the bag. This keeps the food in the bag cool.

16. What are Insulators and Conductors?
Conductors- anything that allows thermal energy to move through it easily (most metals). .
This slide includes a DE Science video clip about insulators and conductors.
The cookie sheet is a conductor. The oven mitt is an insulator.

17. Why does metal feel colder than wood, if they are both at the same temperature?
Metal is a conductor, wood is an insulator.
Examples of metal conductors include: copper, Aluminium, silver & gold.
Metal conducts the heat away from your hands.
Wood does not conduct the heat away from your hands as well as the metal, so the wood feels warmer than the metal.

18. No matter what it feels like, cold does not transfer into your body.
What is really happening here?
Why do you wear heavy clothes when it’s cold outside?