1. HEAT TRANSFER

2. Heat is not a substance (matter)
—but a form of energy.

3. ≠
Matter Energ y
Hand Movement ≠
Drum Sound ≠
Lamp Light ≠
Wood Heat ≠

4. Heat is energy. To heat something up is to speed up its molecules.
Fast-moving molecules have a lot of heat energy—what we call hot.
Slow-moving molecules have less heat energy—what we call cold.
To heat something up is to speed up its molecules.

5. Heat transfer: Heat (energy) can be transferred from object to object.
The movement of heat from hotter objects to colder objects through conduction, radiation, and convection.

6. Conduction:
The transfer of heat between substances in direct contact. If two objects touch, energy is transferred from the hotter object to the cooler object.

7. Conduction
Conduction occurs when a hot object comes in contact with a colder object. The heat energy from the hot object is transferred to the colder object, leaving the warmer object cooler and warming the cooler object.
A hot (red) gloop touches a cold (white) gloop in the game.
The gloop skin has tiny fibers, some of which touch.
When all fibers are equally warm, the movement stops.
The heat moves from a warmer to a neighboring cooler fiber, leaving the warmer one cooler and warming the cooler one.

8. Mix the Heat Activity

9. Convection:
Liquids and gases rise as they get heated and fall as they cool. Heat is carried from place to place with the movement of these fluids.

10. Convection
Convection occurs when an object transfers its heat to another object through a medium, such as water (a liquid), or air (a gas).

11. Radiation Activity

12. Radiation:
When electromagnetic waves hit an object heat energy is transferred to the object. Waves of radiation travel easily in a vacuum as there are no obstacles.

13. Radiation
Radiation does not rely upon any contact between the heat source and the heated object. For example, we feel heat from the sun even though we are not touching it. Heat can be transmitted though empty space by thermal radiation.