1. EQ: What are three ways heat is transferred?
Heat Transfer
EQ: What are three ways heat is transferred?

2. __________________
the transfer of thermal energy through matter from particle to particle as they touch.

3. Conduction
the transfer of thermal energy through matter from particle to particle as they touch.

4. A spoon in a cup of hot soup becomes warmer because the heat from the soup is conducted along the spoon. Conduction is most effective in solids-but it can happen in fluids (liquids and gases).

5. ____________________
* the transfer of thermal energy by the movement of a gas or liquid. The circular motion caused by density differences that result from temperature differences are called convection currents.

6. Convection
Convection is the transfer of thermal energy by the movement of a gas or liquid. The circular motion caused by density differences that result from temperature differences are called convection currents.

7. Convection Currents at Work

8. Convection Currents at Work
Heat pumps
pump
cold air out in the
winter
and
warm air out in the
summer.

9. _____________________
*the transfer of thermal energy by electromagnetic waves such as visible light and infrared waves. (See p ).
This energy can be transferred through particles of matter OR empty space!
Energy from the sun
is an example of radiation.

10. Radiation
Radiation is the transfer of thermal energy by electromagnetic waves such as visible light and infrared waves. (See p ).
This energy can be transferred through particles of matter OR empty space!
Energy from the sun
is an example of radiation.

11. Some energy from the sun is absorbed by Earth and some is radiated back out into space.

12. Review

13. Review
conduction
convection
radiation

14. Review

15. Review
conduction
convection
radiation

18. How does heat move? Heat moves from the ____________ object
to the _____________ object.

19. How does heat move? Heat moves from the warmer object
to the cooler object.

20. What will be the new temperature?
What happens to the temperature of two objects as heat is transferred from one to the other?
The hotter object becomes ________ while the cooler object becomes ________ until both objects are the same temperature. They are said to reach equilibrium.
Hot water
at 70 degrees
Cool water
at 30 degrees
What will be the new temperature?

21. What will be the new temperature?
What happens to the temperature of two objects as heat is transferred from one to the other?
The hotter object becomes cooler while the cooler object becomes hotter until both objects are the same temperature. They are said to reach equilibrium.
Hot water
at 70 degrees
Cool water
at 30 degrees
What will be the new temperature?

22. What will be the new temperature?
What happens to the temperature of two objects as heat is transferred from one to the other?
If there are equal amounts of water in the two cups, add their temperatures and divide by 2.
( ) / 2 = 50
Hot water
at 70 degrees
Cool water
at 30 degrees
What will be the new temperature?

23. True or False?
Everything has thermal energy. Therefore, even ice has heat.
Answer: ____________
Why: ______________________________
___________________________________

24. True or False?
Everything has thermal energy. Therefore, even ice has heat.
Answer: True!
Why: All objects have moving particles that have thermal energy

25. True or False?
A swimming pool has more thermal energy than a pot of hot coffee.
Answer: ___________________
Why: _____________________________
__________________________________

26. True or False?
A swimming pool has more thermal energy than a pot of hot coffee.
Answer: True
Why: A swimming pool has many more particles than a pot of coffee—each with energy (Thermal energy = TOTAL energy)

27. 1. What happens to the movement of the molecules as a substance is heated? 2. How does this affect the size or shape of the object?
Answer 1: __________________________
Answer 2: _________________________

28. 1. What happens to the movement of the molecules as a substance is heated? 2. How does this affect the size or shape of the object?
Answer 1: the molecules move faster
Answer 2: the object expands in size

29. When the air molecules in the balloon are heated and move faster, they become less __________ and lift the balloon off the ground.

30. When the air molecules in the balloon are heated and move faster, they become less dense and lift the balloon off the ground.

31. Why do some objects feel cold to the touch while others feel warm?
Answer: ____________________________
___________________________________

32. Why do some objects feel cold to the touch while others feel warm?
Answer: Objects may FEEL cold because heat is conducted quickly away from the body (conductors) or they may FEEL warm because heat is conducted slowly away from the body (insulators).

33. How do insulators keep a person warm?
Answer: ____________________________
___________________________________
Layers trap air!

34. How do insulators keep a person warm?
Answer: They prevent body heat from escaping.
Layers trap air!

35. Air is a poor conductor. Therefore, it is a good insulator.

36. Review Game Click here to review what you have learned.
Number your paper 1-20 and
see how you do.
Good luck!