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Understanding Heat Transfer: Conduction, Convection, and Radiation Explained

noel-richmond avatar
noel-richmond
51 diapositives · 728 Views · Nov 19, 2014

This overview covers the three primary modes of heat transfer: conduction, convection, and radiation. Conduction involves heat transfer through direct contact in materials, while convection refers to the movement of heated substances, such as fluids, resulting in thermal energy transfer. Radiation allows energy transfer via electromagnetic waves without direct contact. The content also addresses concepts like insulators, conductors, and environmental issues related to heat retention, including the greenhouse effect and global warming.

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  1. Definitions Radiation Convection Conduction Miscellaneous 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500

  2. A: A means of heat transfer by movement of the heated substance itself, such as by currents in a fluid. 100

  3. Q: What is Convection?

  4. A: A material that is a poor conductor of heat and that delays the transfer of heat. 200

  5. Q: What is an insulator?

  6. A: The transmission of energy by electromagnetic waves.

  7. Q: What is radiation?

  8. A: A material through which heat can flow, usually a metal.

  9. Q: What is a conductor?

  10. A: A means of heat transfer within certain materials and from one material to another when the two are in direct contact.

  11. Q: What is conduction?

  12. A: This is the longest wave that can be seen, and it is around 500 degrees Celsius.

  13. Q: What is red light?

  14. A: At 1200 degrees Celsius, radiation gives off yellowish light, better known as this.

  15. Q: What is “white hot”?

  16. A: Radio waves, ultraviolet radiation, X rays, and gamma rays are examples of these.

  17. Q: What are electromagnetic waves?

  18. A: Good absorbers are good emitters; poor absorbers are poor emitters, as stated in this.

  19. Q: What is the emission of radiant energy?

  20. A: Reflection opposes this process.

  21. Q: What is absorption?

  22. A: Convection is an application of this principle, for all buoyed upward by denser surrounding fluid.

  23. Q: What is Archimedes’ principle?

  24. A: As air over the shore rises, cooler air from above the water takes its place (creating this.)

  25. Q: What is a sea breeze?

  26. A: Convection currents stirring in the atmosphere.

  27. Q: What are winds?

  28. Q: If you blow on your hand, with your mouth open, your breath is warm. But if you pucker your lips, your breath is cooler. Why?

  29. A: Expanding air cools.

  30. Q: Putting your fingers beside a flame is much safer than over top of it. Why?

  31. A: Heat travels upward by air convection. Little air travels sideways.

  32. A: Of the metals, silver then copper are top of the list of these.

  33. Q: What are conductors?

  34. A: Simply put: collisions between atoms or molecules and the actions of loosely bound electrons.

  35. Q: What is conduction?

  36. A: Wood, wool, straw, paper, and cork are poor conductors, but are top ______.

  37. Q: What are insulators?

  38. Q: A blanket does not truly give off heat. It slows the transfer of ______ ________ to your surroundings.

  39. A: What is body heat?

  40. Q: Why would snow last longer on a well-insulated roof?

  41. A: Little heat escapes from the house, keeping heat unable to escape and melt snow.

  42. A: Radiation energy emitted from the earth after being absorbed from the sun.

  43. Q: What is terrestrial radiation?

  44. A: Rate of cooling ~ Δ t

  45. Q: What is Newton’s law of cooling?

  46. A: The warming effect whose cause is that short-wavelength radiant energy from the sun can enter the atmosphere and be absorbed by the earth more easily than long-wavelength energy from the earth can leave.

  47. Q: What is the greenhouse effect?

  48. Q: Our present environmental concern is that excess carbon dioxide and other atmospheric gases will trap too much energy, causing this.

  49. A: What is global warming?

  50. Q: The radiant energy from the sun is composed of short waves and lets off three waves. What three waves?