HEAT How is thermal energy transferred?

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1 HEAT How is thermal energy transferred? Give an example of conduction? What is a convection current? Explain radiant energy? 1/3/2017 Heat Notes 1

2 1/3/2017 Heat Notes 2

3 NEED TO KNOW VOCABULARY: Conduction Convection Radiant Conductor vs Insulator Convection Cell Radiation heat source vs heat sink stay tuned Specific Heat Calorie 1/3/2017 Heat Notes 3

4 1/3/2017 Heat Notes 4

5 Heat travels in only one direction, there are three processes by which heat can travel from one object or area to another. The direction is from high to low. The three forms of heat energy transfer are: 1.Conduction 2.Convection 3.Radiant 1/3/2017 5

6 Conduction is a form of heat transfer that occurs when two objects are in direct contact. Conduction is the transfer of heat between objects with different temperatures that are touching. 1/3/2017 Heat Notes 6

7 Any time objects with different temperatures come into contact, particles in both objects collide. Kinetic energy flows from particles in the warmer object to particles in the cooler object, raising the temperature of the cooler object. 1/3/2017 Heat Notes 7

8 1. Conduction also occurs when particles in the same object are heated to different temperatures. During this process, energy is transferred from high energy state particles of the object to low energy state particles in another part of the object. Copper pipe, paper and torch demo Good idea or bad idea? 1/3/2017 Heat Notes 8

9 Conduction can also Ex: Hot cup of tea occur between multiple objects in contact with on another. Where is that occurring here? 1. Spoon & cup 2. tea bag & table top 1/3/2017 Heat Notes 9

10 Let s review - What are the 2 different ways in which conduction can occur? /3/2017 Heat Notes 10

11 The Second Law of Thermodynamics When heat flows from a warm object to a cool object the thermal energy of the warm object and the thermal energy of the cool object. 1/3/2017 Heat Notes 11

12 1/3/2017 Heat Notes 12

13 Convection is the flow of energy through a liquid or gas (fluids) caused by hot particles rising and cool particles sinking. Particles with higher KE flow through the fluid and cool particles replace the rising warm particles. NOTE: it only occurs in a fluid torch demo 1/3/2017 Heat Notes 13

14 DESCRIBING CONVECTION As the flame touches the bottom of the kettle, conduction occurs within the metal. Inside of the kettle, convection occurs, as water swirls about. As water near the bottom of the kettle is heated, it expands then rises and becomes less dense. Cooler water then swirls in replacing the rising hot water. Eventually another convention current occurs in the form of steam atop the kettle. This motion is referred to as a or 14

15 DESCRIBING CONVECTION glass convection cell demo In a convection current, regardless of the medium (water or air) heat energy cause the fluid to expand. As it does so, it becomes less dense. This lower density state causes it to rise, while higher density particles then rush in to fill the void. In a closed system the fluid which has now expanded and risen will eventually cool, thus becoming denser and then settling back down. currents always rise while ones fall. 1/3/2017 Heat Notes 15

16 Radiant is the transfer of heat energy in the form of electromagnetic waves.. With radiant heat radiation, one object emits heat energy and another absorbs it. 1/3/2017 Heat Notes 16

17 Radiometer What causes it to spin? Hypothesis: Radiometer demo. 1/3/2017 Heat Notes 17

18 1/3/2017 Heat Notes 18

19 We of course cannot see infrared or radiant heat wave but if we could they might look something like this. 1/3/2017 Heat Notes 19

20 Can you guess what this is? 1/3/2017 Heat Notes 20

21 1/3/2017 Heat Notes 21

22 QUESTION 1 Which method of heat energy transference is illustrated here? 1/3/2017 Heat Notes 22

23 QUESTION 2 Number or draw arrows indicating the steps for the text boxes below. 1/3/

24 QUESTION 3 Convection occurs when particles in a fluid sink to replace the rising particles in the fluid. The constant cycle of warm fluid rising and cool fluid sinking is known as a. 1/3/2017 Heat Notes 24

25 QUESTION 4 A father and son are walking along the beach. The son runs toward the water and dips his hands in the cool ocean. Then, he walks back to his dad and grabs his hand. Matthew, your hands are so cold now! his dad exclaims. How was the heat conducted in this scenario? CIRCLE ALL THAT APPLY a. From Matt s body to his now cooler hand. b. From Matt s cold hand to his fathers. c. From the father s hand to Matt s cold hand. d. From the cool ocean to Matt s hand. e. From Matt s hand to the cool ocean. 1/3/2017 Heat Notes 25

26 QUESTION 5 Can convection occur in solids? yes, because solids are fluids yes, because particles in solids move in the same way as particles in liquids and gases no, because solids are not fluids no, because solid particles cannot move freely 1/3/2017 Heat Notes 26

27 Conduction can occur even when the atoms of two different objects are not in contact with each other? T or F? 1/3/2017 Heat Notes 27

28 QUESTION 6 encounter every day. Give examples of radiant energy that we List as many as you can below: 1/3/

29 Select the model that accurately depicts how particles flow in a convection current. Heat Notes 29

Name Class Date. What are three kinds of energy transfer? What are conductors and insulators? What makes something a good conductor of heat?

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