2.  Rub your hands together. What happened?  You just used energy to make heat!  Energy is the ability to change something or do work.  Whenever the location, makeup, or look of something changes, energy is used!

5. The colors in these thermo grams, or heat picture, show the different amounts of heat energy.

6. A thermometer is based on the idea that matter expands when its particles move faster and contracts when they slow down. If it touches matter with particles that are speeding up, particles in the liquid inside the thermometer speed up too. They move farther apart. Because the liquid expands more than the glass tube, it moves up the tube. The reading on the number line shows a greater number of degrees. (It’s hotter)

7. If the particles slow down, the liquid contracts. The shorter column in the tube shows fewer degrees. The thermometer must be on or in whatever it’s measuring.

8. Think of a large pot and a small pot that are each half filled with boiling water. Because the large pot holds more water, it has many more water particles than the small pot has. More particles mean more energy of motion. The large pot has more thermal energy.

9. Heat is the transfer of thermal energy. Heat can be moved in several ways.

10. Remember when you rubbed your hands together earlier? You used mechanical energy to make heat. When solids are touching, heat energy moves by conduction. Conduction is the transfer of heat energy by one thing touching another.

11. Some materials let heat move through them more easily than others do. A material that readily allows heat to move is a conductor. Many metals, such as aluminum, copper, and iron, conduct heat well. OWWW It’s Hot! It’s Hot!

12. You also know that some things do not get too warm even when they touch something hot. They are insulators. An insulator is a material that limits the amount of heat that passes through it. Have you noticed that many pots and pans have wooden handles? That's because wood is a great insulator. Get back here! I’m glad this has a wooden handle!

13. The raised hairs of Japanese macaque monkeys trap heat. The monkeys share body heat to keep warm in the snow.

14. Have you felt how warm a kitchen gets when a stove is on? The warmth is the result of convection. In convection, a gas or a liquid moves from place to place. A pattern of flowing heat energy is a convection current. A convection current forms when gas or liquid transfers heat as it moves. Wow! It sure is getting hot in here!

15. You know that the Sun is a major energy source. Every time you get warm in the Sun, you feel radiation. You feel it when you sit near a fire too. Radiation is energy that is sent out in little bundles. When radiant energy hits you, the particles in your skin move more quickly. You feel warm.

18. Heat Energy Quiz A(n) _____ limits the amount of heat that passes through it. radiation insulator Conduction Convection current Convection current conductor

19. Oh no! Quick choose again! Oh no! Quick choose again!

20. Great work!

21. Heat Energy Quiz _____ is one kind of energy that travels from the Sun through space. radiation Thermal Energy Thermal Energy Conduction Convection current Convection current conductor

22. Oh no! Quick choose again! Oh no! Quick choose again!

23. Great work!

24. Heat Energy Quiz A material that allows heat to pass through it is a(n) _____. radiation Thermal Energy Thermal Energy Conduction Convection current Convection current conductor

25. Oh no! Quick choose again! Oh no! Quick choose again!

26. Great work!

27. Heat Energy Quiz The transfer of energy by one object touching another is _____. radiation Thermal Energy Thermal Energy Conduction Convection current Convection current conductor

28. Oh no! Quick choose again! Oh no! Quick choose again!

29. Great work!

30. Heat Energy Quiz The total energy of all the particles in a body is its _____. radiation Thermal Energy Thermal Energy Conduction Convection current Convection current conductor

31. Oh no! Quick choose again! Oh no! Quick choose again!

32. Great work! You did it!

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