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Volume B Chapter 25 Transmission of Heat
Oh no! You will spoil the flask  if you put cold water in it.  After this, the flask cannot be used  to keep water hot anymore. Myth or Truth?
Why are the handles of saucepans usually made of plastic?
Why is food packed in styrofoam boxes?
Cooling fins at the back of refrigerators. Why are they always painted black?
[object Object],[object Object],[object Object],What we will learn…
Heat is a form of  energy  that is transmitted from a  region of higher to lower temperature . Heat Moves!
IN 3 WAYS… CONDUCTION CONVECTION RADIATION Heat Moves!
They are three processes of heat transfer shown in the picture. 1  represents  2  represents 3  represents conduction . convection . radiation .
Conduction is  transmission of heat  through a material from the  hot regions to the cold regions   without any visible movement  of the material. CONDUCTION
CONDUCTION ,[object Object],[object Object],See movie
How Conduction Works in solids ,[object Object],[object Object]
How Conduction Works in solids ,[object Object],[object Object],See movie
Conduction of heat through solids Observation :  Observe the lengths of wax that have melted on the different rods in a given interval of time . Wood Iron Aluminium Copper
[object Object],[object Object],[object Object],Metals conduct heat much  faster   then non-metals as they have  free electrons. Conduction of heat by metals
[object Object],[object Object],[object Object],Good & Bad Conductors of Heat
Good & Bad Conductors of Heat Good conductors Poor conductors (insulators) Silver Copper Aluminum Brass Iron Lead Stainless Steel Vacuum Air Styrofoam Body fat Cork Water Glass
[object Object],[object Object],[object Object],[object Object],Application of Conduction
2. Uses of Poor Conductors (Insulators) ,[object Object],[object Object],[object Object],insulator  Application of Conduction
[object Object],Application of Conduction
. Try This :  Fill in the table appropriately Brass Wood Aluminium Air Foam Copper Iron Water Cotton Plastic Mercury Gold Good Conductors Good Insulators
. ANSWER :  Fill in the table appropriately Brass Wood Aluminium Air Foam Copper Iron Water Cotton Plastic Mercury Gold Good Conductors Good Insulators (or Bad Conductors) Brass Aluminium Wood Air Copper Iron Foam Water Mercury  Gold Cotton Plastic
Convection is the  transmission of heat  through a  fluid (liquid or gas)  from the  hot to the cold  region by the  circulating movement  of the fluid. CONVECTION cool  (higher density) hot (lower density) liquid or gas
[object Object],[object Object],[object Object],[object Object],CONVECTION
CONVECTION IN LIQUIDS See movie
[object Object],[object Object],[object Object],[object Object],CONVECTION IN LIQUIDS
7.2 Convection ,[object Object],[object Object],[object Object],[object Object],[object Object]
7.2 Convection ,[object Object],[object Object],[object Object],[object Object],[object Object]
CONVECTION IN GASES
[object Object],[object Object],[object Object],[object Object],[object Object],CONVECTION IN GASES
Application of Convection Sea and Land Breezes
[object Object],[object Object],[object Object],[object Object],[object Object],Application of Convection
Application of Convection Sea and Land Breezes
[object Object],[object Object],[object Object],[object Object],[object Object],Application of Convection
Application of Convection Hot Water System
[object Object],[object Object],[object Object],[object Object],Application of Convection Hot Water System
Application of Convection Air- Conditioners
[object Object],[object Object],[object Object],Application of Convection Air- Conditioners
QUIZ TIME!!
Q1. Which of the following is a good conductor of heat? A. Water B. Oxygen C. Wood D. Aluminium
Q2. Why does heat conduction take place faster in metals? ,[object Object],[object Object],[object Object],[object Object]
Q2. Which of these would you use for the frying pan and its handle? ,[object Object],[object Object],[object Object],[object Object]
Q3. The purpose of using a double-glazed window is to ,[object Object],[object Object],[object Object],[object Object]
Q4. We need to put on more clothes in winter because ,[object Object],[object Object],[object Object],[object Object]
QUIZ TIME!!
Q1. Convection takes place because ,[object Object],[object Object],[object Object],[object Object]
Q2. The purple color stream is seen to travel  upwards from the center and downwards  from the sides because ,[object Object],[object Object],[object Object],[object Object]
Q3. Convection of heat cannot take place in ,[object Object],[object Object],[object Object],[object Object]
Q4. We place air conditioners near the ceiling  because ,[object Object],[object Object],[object Object],[object Object]
Q5. Sea breeze occurs ,[object Object],[object Object],[object Object],[object Object]
Radiation is the  transmission of heat  from one place to another by means of  infra-red radiation  which can travel through  vacuum or air Radiation
Rate of Emitting (giving out) and Absorbing Heat by Radiation is affected by:   (a)  surface temperature (b)  colour and texture of the surface (c)  surface area Radiation
[object Object],[object Object],Radiation
Radiation Why does the cork on the dull black surface fall off first? Ans: Dull black surfaces are good absorbers of heat, thus it melts the wax faster
Application of Radiation Good Emitters Poor Emitters Cooling fins  at the back of a refrigerator painted  dull black A  shiny metal  teapot and  aluminum foil keep contents  warm
Application of Radiation Good Absorbers Poor Absorbers Solar heating panels  are painted in  dull black paint to absorb  heat  from sun Houses in hot countries are painted in  white or light-coloured paint ,  to keep them  cooler . Light colours  are chosen for clothes and cars in hot weather
[object Object],[object Object],[object Object],[object Object],[object Object],Application of Radiation
Application of Radiation
Application of Radiation Structure Reduces heat loss/gained by: vacuum  in between the double glass walls  conduction or convection  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Foam plastic  support conduction Plastic  cap convection
 
LET'S RECAP ,[object Object],Structure Purpose (reduces heat loss/gained by)
They are three processes of heat transfer shown in the picture. 1  represents  2  represents 3  represents conduction . convection . radiation .

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Transmission of heat (ppt)

  • 1. Volume B Chapter 25 Transmission of Heat
  • 2. Oh no! You will spoil the flask if you put cold water in it. After this, the flask cannot be used to keep water hot anymore. Myth or Truth?
  • 3. Why are the handles of saucepans usually made of plastic?
  • 4. Why is food packed in styrofoam boxes?
  • 5. Cooling fins at the back of refrigerators. Why are they always painted black?
  • 6.
  • 7. Heat is a form of energy that is transmitted from a region of higher to lower temperature . Heat Moves!
  • 8. IN 3 WAYS… CONDUCTION CONVECTION RADIATION Heat Moves!
  • 9. They are three processes of heat transfer shown in the picture. 1 represents 2 represents 3 represents conduction . convection . radiation .
  • 10. Conduction is transmission of heat through a material from the hot regions to the cold regions without any visible movement of the material. CONDUCTION
  • 11.
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  • 13.
  • 14. Conduction of heat through solids Observation : Observe the lengths of wax that have melted on the different rods in a given interval of time . Wood Iron Aluminium Copper
  • 15.
  • 16.
  • 17. Good & Bad Conductors of Heat Good conductors Poor conductors (insulators) Silver Copper Aluminum Brass Iron Lead Stainless Steel Vacuum Air Styrofoam Body fat Cork Water Glass
  • 18.
  • 19.
  • 20.
  • 21. . Try This : Fill in the table appropriately Brass Wood Aluminium Air Foam Copper Iron Water Cotton Plastic Mercury Gold Good Conductors Good Insulators
  • 22. . ANSWER : Fill in the table appropriately Brass Wood Aluminium Air Foam Copper Iron Water Cotton Plastic Mercury Gold Good Conductors Good Insulators (or Bad Conductors) Brass Aluminium Wood Air Copper Iron Foam Water Mercury Gold Cotton Plastic
  • 23. Convection is the transmission of heat through a fluid (liquid or gas) from the hot to the cold region by the circulating movement of the fluid. CONVECTION cool (higher density) hot (lower density) liquid or gas
  • 24.
  • 26.
  • 27.
  • 28.
  • 30.
  • 31. Application of Convection Sea and Land Breezes
  • 32.
  • 33. Application of Convection Sea and Land Breezes
  • 34.
  • 35. Application of Convection Hot Water System
  • 36.
  • 37. Application of Convection Air- Conditioners
  • 38.
  • 40. Q1. Which of the following is a good conductor of heat? A. Water B. Oxygen C. Wood D. Aluminium
  • 41.
  • 42.
  • 43.
  • 44.
  • 46.
  • 47.
  • 48.
  • 49.
  • 50.
  • 51. Radiation is the transmission of heat from one place to another by means of infra-red radiation which can travel through vacuum or air Radiation
  • 52. Rate of Emitting (giving out) and Absorbing Heat by Radiation is affected by: (a) surface temperature (b) colour and texture of the surface (c) surface area Radiation
  • 53.
  • 54. Radiation Why does the cork on the dull black surface fall off first? Ans: Dull black surfaces are good absorbers of heat, thus it melts the wax faster
  • 55. Application of Radiation Good Emitters Poor Emitters Cooling fins at the back of a refrigerator painted dull black A shiny metal teapot and aluminum foil keep contents warm
  • 56. Application of Radiation Good Absorbers Poor Absorbers Solar heating panels are painted in dull black paint to absorb heat from sun Houses in hot countries are painted in white or light-coloured paint , to keep them cooler . Light colours are chosen for clothes and cars in hot weather
  • 57.
  • 59.
  • 60.  
  • 61.
  • 62. They are three processes of heat transfer shown in the picture. 1 represents 2 represents 3 represents conduction . convection . radiation .