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Understanding Heat Transfer:

Understand the behavior of heat and its transfer through conduction, convection, and radiation. Learn how heat moves and its impact on objects. Explore heat transfer methods and the science behind them.

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Understanding Heat Transfer:

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  1. Understanding Heat Transfer: Conduction, Convection, and Radiation

  2. In this lesson you will discover: • The way in which heat behaves. • The energy transfer methods: conduction, convection and radiation.

  3. Heat Transfer • Heat always moves from a warmer place to a cooler place. • Hot objects in a cooler room will cool to room temperature. • Cold objects in a warmer room will heat up to room temperature.

  4. Question • If a cup of coffee and a popsicle were left on the table in this room what would happen to them? Why? • The cup of coffee will cool until it reaches room temperature. The popsicle will melt and then the liquid will cool to room temperature.

  5. Heat Transfer Methods These are: • Conduction • Convection • Radiation

  6. When you heat a metal strip at one end, the heat travels to the other end. As you heat the metal, the particles vibrate. These vibrations make the adjacent particles vibrate. The vibrations are passed along the metal and so is the heat. We call this? Conduction

  7. Convection Cools at the surface Hot water rises Cooler water sinks

  8. Convection Cooler, more d____, fluids sink through w_____, less dense fluids. ense armer In effect warmer liquids and gases r___ up. ise ink Cooler liquids and gases s___.

  9. The third method of heat transfer: There are no particles between the Sun and the Earth so it CANNOT travel by conduction or by convection. How does heat energy get from the Sun get to the Earth? ? RADIATION

  10. Radiation • Energy waves from the sun travel in straight lines. • Because there are no particles in space, it’s a vacuum, radiation does not need a medium to travel through. • The Sun’s rays (radiation) travel at the speed of light; 300,000,000 m/s.

  11. Radiation travels in straight lines True/False Radiation can travel through a vacuum True/False Radiation requires particles to travel True/False Radiation travels at the speed of light True/False

  12. 1. Which of the following is not a method of heat transfer? A. Radiation B. Insulation C. Conduction D. Convection

  13. 2. In which of the following are the particles closest together? A. Solid B. Liquid C. Gas D. Fluid

  14. 3. How does heat energy reach the Earth from the Sun? A. Radiation B. Conduction C. Convection D. Insulation

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