Acc intro to thermal energy spring 2012

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Acc intro to thermal energy spring 2012

  1. 1. Intro to Thermal Energy November 7, 2013
  2. 2. Objectives 1. Explain the motion of molecules in the different states of matter 2. Understand the definition of thermal energy and what happens in thermal equilibrium
  3. 3. Movement of atoms • All matter is constantly moving • Moving particles determines whether an object is solid, liquid, or gas
  4. 4. Kinetic Energy • The warmer an object is the more kinetic energy it has
  5. 5. Thermal Energy • The total energy of all it’s atoms and molecules
  6. 6. Flow of Thermal Energy • From a warmer substance to a colder one • HEAT – thermal energy in motion
  7. 7. Hot or Cold • Temperature • Thermometer measures temperature by expansion or contraction of a liquid Eureka 20
  8. 8. Temperature • Related to the random motion of atoms and molecules • average kinetic energy of molecules
  9. 9. • Thermometers read their own temperature • Energy flows between the thermometer and the object until they reach an equal temperature • This equilibrium is called a Thermal equilibrium
  10. 10. Upper Limit of Temperature Solid  Liquid  Gas What happens after the Gas state? Plasma – Cloud of electrically charged particles - stars, millions of degrees C
  11. 11. What’s cold? • The absence of thermal energy • An object is cold because of the loss in thermal energy • Eureka 21
  12. 12. Heat – change in Et • Measured in Joules • 4.2 Joules = heat to change 1 gram of water 1 Celsius degree
  13. 13. c alorie • Unit of heat used in the United States • Amount of heat needed to change 1 gram of water 1 Celsius degree • c = Mass (Change in temp)(specific heat) • 1 c alorie = 4.2 joules Water’s specific heat = 1
  14. 14. • Energy ratings of food and fuels are measured by the energy released when they are burned • Kilo calories = C alories we know on food packages (capitol C)
  15. 15. • To the Weight Watcher, the peanut contains 10 C alories • To the physicist, it releases 10,000 c alories of energy when burned or digested

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