heat energy transfer conduction, convention & radiation
TRANSCRIPT
![Page 1: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/1.jpg)
Heat Energy Transfer
Conduction, Convention & Radiation
![Page 2: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/2.jpg)
Essential Standard
• 6.P.3 Understand characteristics of energy transfer and interactions of matter and energy.
![Page 3: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/3.jpg)
Clarifying Objective
• 6.P.3.1 Illustrate the transfer of heat energy from warmer objects to cooler ones using examples of conduction, radiation and convection and the effects that may result.
![Page 4: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/4.jpg)
Essential Questions
• What are the different ways that energy be transferred?
![Page 5: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/5.jpg)
Heat Transfers
• Heat atoms are always looking to try to find cold atoms
• Heat atoms can give cold atoms their heat 3 different ways
• These 3 ways are called ① Conduction ② Convection③ Radiation
![Page 6: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/6.jpg)
Why Does Heat Transfer
• Heat transfers from object to object because EVERY OBJECT IS TRYING TO BECOME WARMER
• Objects try to become what the dominate temperature is (room)
![Page 7: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/7.jpg)
Conduction
• Conduction is the first way atoms with heat in them will transfer them to cold atoms
• Conduction is the heat transfer of two solids joined together through a conductor (direct contact)
![Page 8: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/8.jpg)
Conduction
• A conductor is what actually what actually transfers the heat from one solid to another solid
• Conduction mediums are always solids (they only transfer heat through solids)
![Page 9: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/9.jpg)
Conductor
• Conductors are mediums that will transfer heat from one solid to another
• Hot atoms move through the conductors to transfer their heat to cold atoms
• Some items are better conductors than others
![Page 10: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/10.jpg)
Conductor• Solids are always the best
conductors because their atoms are attached and not spread out so the heat can move through them better
• Gases are the worst conductors because their atoms are so spread out and it will take longer for them to bump into each other
• Metals are the best conductors because they are solids and their atoms have the most density
![Page 11: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/11.jpg)
How Does Conduction Happen?
① Solid with hot atoms look for cold solid atoms
② The conductor is placed between the solid hot atoms & the solid cold atoms
③ Hot atoms (excited) vibrate & hit each other & move through the conductor
![Page 12: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/12.jpg)
How Does Conduction Happen?
④ Once the hot atoms have moved through the conductor they contact the cold atoms of the other solid
⑤ They transfer the heat from their atoms (hot atoms) to the cold atoms and warm them up
⑥ Now all atoms in both solids are warm
![Page 13: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/13.jpg)
Conduction (Example)
• http://www.youtube.com/watch?v=Gyj444FK0zs
![Page 14: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/14.jpg)
Convection
• Convection is the moving of heat through gas or liquid mediums
• Convection will only transfer heat through gasses or liquids
![Page 15: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/15.jpg)
Convection Process
• http://www.youtube.com/watch?v=liKcJKjvFcY
• 0:00-1:36
![Page 16: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/16.jpg)
How Does Convection Happen?
① Hot atoms form and become excited and start to vibrate
② As they vibrate the hot atoms rise because the atoms begin to separate and become less dense
③ The hot atoms that rise push the cold atoms to the bottom and they are heated
![Page 17: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/17.jpg)
How Does Convection Happen?
④ Then those atoms rise and push the next batch of cold dense atoms to the bottom to be warmed again
⑤ The process continues and forms a CONVECTION CURRENT
![Page 18: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/18.jpg)
![Page 19: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/19.jpg)
Convection Example
• http://www.youtube.com/watch?v=Gyj444FK0zs
![Page 20: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/20.jpg)
Radiation• Transfer of heat atoms through
electromagnetic wave motion
• Radiation involves light photons not atom particles
• All waves on the Electromagnetic Spectrum will transfer heat through radiation
① Radio Waves② Microwaves③ Infrared Waves④ Ultraviolet Waves⑤ X-Ray Waves⑥ Gamma Waves
![Page 21: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/21.jpg)
Electromagnetic Spectrum
![Page 22: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/22.jpg)
Radiation (Heat Absorption)• About 50% (half) of the
radiation heat transfer comes from VISIBLE LIGHT part of the spectrum
• The amount of heat absorbed through radiation depends on…
① Intensity of the waves (visible waves are most intense)
② Color of the object the radiation wave is hitting
• This is why darker colors absorb more heat than lighter colors
![Page 23: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/23.jpg)
How Does Radiation Happen?
① Waves from the Electromagnetic Spectrum radiate heat
② The electromagnetic waves carry the heat through any medium
③ The heat waves hit the object and warm it up
![Page 24: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/24.jpg)
Radiation Example
• Campfires radiate heat through light waves from the electromagnetic spectrum
• Microwaves do the same thing
![Page 25: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/25.jpg)
Radiation Video
• http://www.youtube.com/watch?v=GYUN8o4eJ24
![Page 26: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/26.jpg)
Essential Questions
• Get with a partner and answer…
• What are the different ways that energy be transferred?
![Page 27: Heat Energy Transfer Conduction, Convention & Radiation](https://reader036.vdocuments.us/reader036/viewer/2022081501/56649d8b5503460f94a72d4a/html5/thumbnails/27.jpg)
Important Points• Heat transfer occurs because all
objects are trying to become warmer
• Conduction is heat transferring through direct contact between objects
• Conduction must have conductors to occur
• Metals are good conductors because their atoms are close together
• Conduction only occurs through two SOLIDS
• Convection is heat transfer through currents
• Convections currents occur in liquids & gasses only
• Radiation is the transfer of heat through photons on waves
• It does not include atoms
• Radiation depends on how INTENSE the wave is & the COLOR of the object it is warming