Part I: Temperature and Thermal Energy Transfer Heat Transfer Part I: Temperature and Thermal Energy Transfer What is temperature? What is thermal energy? How does the temperature of the ice chip compare to the temperature of your hand? In the example of holding ice, what evidence indicates that thermal energy transfers? In the example of holding ice, where does the thermal energy come from? In the example of holding ice, where does the thermal energy go? Using the example of holding ice, explain when the thermal energy transfer stops. Can you summarize how thermal energy moves from one object to another? Thermal energy always moves from substances with __________________ temperatures to objects with ___________________________ temperatures. 1

Heat Transfer Part II: Conduction Rub your hands together as fast as you can for 30 seconds. Now touch your upper arm with your hand. Record what happens. Observe the candle wax melter in the front. Illustrate what you observed. Use labels and arrows to identify the transfer of energy. What type of heat transfer occurs to melt the wax? What pattern was evident in the movement of thermal energy? What evidence did you observe that showed heat transfer. In your own words, define conduction. 2

Part III: Convection In your own words, define convection. Heat Transfer Part III: Convection Draw a lava lamp and show what happens to the blob you observe. Use arrows and labels to identify the parts of the lamp and the heat transfer. Draw how a space heater warms up a room (same concept as a lava lamp). What are the 3 states of matter? In which state of matter did the transfer of thermal energy occur in the lava lamp? In which state of matter does the transfer of thermal energy occur in a microwave? In your own words, define convection. 3

Heat Transfer Part IV: Radiation Hold your hand over the flame. What do you feel? Why? Hold your hand a couple inches higher above the flame. Is there a difference? In thermal energy transfer by radiation, how does distance from the thermal energy source affect the amount of thermal energy transfer occurring in a substance? What happens when you hold a marshmallow over a fire? What happens when you lay out in the sun all day? Why? These are examples of radiation. In your own words, define radiation. 4

Example of Heat Transfer Conduction, Convection, or Radiation Reflections and Conclusions Identify the type of energy transfer (conduction, convection, or radiation) for each description below. Example of Heat Transfer Conduction, Convection, or Radiation Hot chocolate is stirred with a spoon and the spoon gets hot The Sun warms your skin on a cold day. Macaroni rises and falls in a pot of heated water. You burn your hand by touching a hot stove. Hot air balloon rises. The air near the ceiling in a room is warmer than the air near the floor. The material in a lava lamp rises and falls. The sidewalk increases in temperature on a sunny day. The sidewalk burns your bare feet in the summer time. 5