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Heat and Heat Energy

Heat and Heat Energy. Energy in Matter. 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!.

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Heat and Heat Energy

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  1. Heat and Heat Energy

  2. Energy in Matter • 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!

  3. As an object becomes hotter, its particles move faster.

  4. As the object cools, its particles move more slowly

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

  6. Measuring Moving Particles • 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. Measuring Moving Particles • 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. Measuring Moving Particles • 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. • Think of a large pot and a small pot that are each half filled with boiling water.

  9. How does Heat Move? Heat is the transfer of thermal energy. Heat can be moved in several ways.

  10. How Does Heat Move? • 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. Conductors OWWW It’s Hot! It’s Hot! • 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.

  12. Insulators Get back here! I’m glad this has a wooden handle! • 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.

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

  14. Convection Wow! It sure is getting hot in here! • Have you felt how warm a kitchen gets when a stove is on? The warmth is the resultof 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.

  15. Radiation • 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.

  16. Radiation from the light warms the lizard.

  17. Quiz Time – Let’s see what you remembered!

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

  19. Oh no! Quick choose again!

  20. Great work!

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

  22. Oh no! Quick choose again!

  23. Great work!

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

  25. Oh no! Quick choose again!

  26. Great work!

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

  28. Oh no! Quick choose again!

  29. Great work!

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

  31. Oh no! Quick choose again!

  32. Great work! You did it!

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