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Thermal Energy and Heat

Thermal Energy and Heat. Temperature. The measure of how HOT or COLD and object is. Temperature. Related to the AVERAGE KINETIC ENERGY of the particles of an object. How temperature changes. As an object heats up, its particles move faster.

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Thermal Energy and Heat

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  1. Thermal Energy and Heat

  2. Temperature • The measure of how HOT or COLD and object is.

  3. Temperature • Related to the AVERAGE KINETIC ENERGY of the particles of an object.

  4. How temperature changes • As an object heats up, its particles move faster. • As a result the average kinetic energy increases and ……. • The temperature increases.

  5. Sand in the cup demo Temperature Kinetic energy

  6. Thermal Energy • The total energy of all of the atoms and molecules in a substance.

  7. Thermal Energy • Depends on: • MASS • TEMPERATURE

  8. Demo: nuts and bolts in water

  9. Which has more thermal energy… • …A cup of coffee or a pot of coffee?

  10. Which has more thermal energy… • …A cup of coffee or a pot of coffee? • THE POT OF COFFEE • WHY???

  11. Which has more thermal energy… • …A cup of coffee or a pot of coffee? • THE POT OF COFFEE • WHY??? • It has more MASS.

  12. Which has more thermal energy….. • A cup of hot tea or a cup of iced tea?

  13. Which has more thermal energy….. • A cup of hot tea or a cup of iced tea? • The cup of HOT tea. • WHY?

  14. Which has more thermal energy….. • A cup of hot tea or a cup of iced tea? • The cup of HOT tea. • WHY? • It is at a higher TEMPERATURE.

  15. HEAT • The transfer of thermal energy from one object to another because of a temperature difference.

  16. Thermal energy ALWAYS flows from WARMER to COLDER.

  17. 3 Ways heat is transferred • Conduction • Convection • Radiation

  18. CONDUCTION • The transfer of thermal energy in materials that are touching. • Occurs as particles collide

  19. Conduction • Involves no overall transfer of matter • Takes place more easily in solids than in liquids or gases.

  20. Conduction

  21. Conductors • Objects that conduct thermal energy well.

  22. Insulators • Poor conductors of heat • Examples:

  23. Insulators

  24. Insulators

  25. Why do tile floors feel colder than wooden floors?

  26. Why does your tongue stick to a pole on a freezing cold day?

  27. Convection • The transfer of thermal energy by the movement of FLUIDS with different temperatures.

  28. Convection Current • When you heat up a liquid or gas the molecules move faster, and spread out and become less dense. • Since it is less dense it rises. • After it rises, it is away from the heat source and cools. • Once it is cool, it sinks.

  29. Convection Current

  30. Convection Currents

  31. Convection currents

  32. Home heating and convection currents

  33. Radiation • The transfer of thermal energy by electromagnetic waves traveling through space.

  34. Radiation • Does NOT involve the movement of particles. • Is the only form of transfer of thermal energy that can occur in space.

  35. Radiation Shiny objects reflect electromagnetic energy Dull, dark objects absorb electromagnetic energy Absorbed electromagnetic energy is converted into thermal energy.

  36. Radiation

  37. Radiation

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