CHAPTER 09 - TRANSFER OF HEAT | 9TH PHYSICS NOTES

Qasim Tariq 11-01-2020Notes


After studying this unit, the students will be able to:

  • recall that thermal energy is transferred from a region of higher temperature to a region of lower temperature.
  • describe in terms of molecules and electrons , how heat transfer occurs in solids.
  • state the factors affecting the transfer of heat through solid conductors and hence, define the term Thermal Conductivity.
  • solve problems based on thermal conductivity of solid conductors.
  • write examples of good and bad conductors of heat and describe their uses.
  • explain the convection currents in fluids due to difference in density.
  • state some examples of heat transfer by convection in everyday life.
  • explain that insulation reduces energy transfer by conduction.
  • describe the process of radiation from all objects.
  • explain that energy transfer of a body by radiation does not require a material medium and rate of energy transfer is affected by:
    colour and texture of the surface
    surface temperature
    surface area
  • describe convection in water heating by putting a few pinky crystals in a round bottom flask.
  • explain that water is a poor conductor of heat.
  • investigate the absorption of radiation by a black surface and silvery surfaces using Leslie cube.
  • investigate the emission of radiation by a black surface and silvery surfaces using Leslie cube.


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  • 9th Physics Notes
  • 9th Physics Chapter 9
  • Matric Notes
  • Class IX Helping Notes
  • Matriculation Notes
  • Matric Part-1 Notes

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