1. 2.3 Transfer of Energy as heat can be controlled.
Helpful animations

2. Energy moves as heat in three ways:
Conduction
Convection
Radiation

3. Conduction
The process that moves energy from one object to another when they are physically touching.
Ex, metal spoon is in a cup of hot cocoa.
Ex, any physical contact with anything
(That’s Hot!)

4. Controlling the Heat?
*Conductors- Materials that transfer energy easily
Ex. -Iron or metal pots and pans
(The handles of pot and pans are plastic to stop the energy transfer)
Insulators- are poor conductors (they do not transfer energy easily)

5. Controlling the Heat (continued)
Insulators- are poor conductors (they do not transfer energy easily)
Ex. wood, paper, Plastic foam, thermos,
Keeps drinks cold or hot.

6. Convection The process that transfers energy by movement of particles
within a liquid or gas.
Process –> (When cooler – denser particles replace the warmer – less dense particles)

7. Examples of Convection
Keeping houses warm
Air outside in our atmosphere.
Water molecules move to heat a pot of water

8. Radiation
The energy travel as Electromagnetic Waves such as: Visible light, Microwaves, Infrared Light.
All things emit radiation – release energy to their surroundings. (Even People!)
Major source of Electromagnetic Waves is the sun
Things that absorb energy from the sun.
Air, Concrete, Sidewalks..etc

11. Polar bear’s skin/fur are very good insulators-
Polar bears have several layers of insulation to keep
their body heat in.

12. Warmest clothes are better insulators. Ex. Wool
Your Clothes do the same for you. Your body heat is trapped by the cloth. (keeping you nice and warm.)
Warmest clothes are better insulators. Ex. Wool

13. *Keeping cocoa hot in a Thermos - this is an insulator
A Thermos keeps liquid warm because it keep the energy from flowing out of the container.

14. Heaters or fireplaces help keep your houses warm
Heaters or fireplaces help keep your houses warm. Insulation within the walls of your house help keep the energy inside the house.

15. Helpful website