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Chapter 4 Heat

  • Temperature is the hotness and coldness of a body.
  • Our sensation tells the hotness of the object.
  • Thermometer is the device on which temperature is measured.
  • A thermometer contains mercury inside it.
  • Temperature can be measured at three scales- Celsius scale, Fahrenheit scale and kelvin scale.
  • Clinical thermometer shows temperature 35 0 C to 42 0 C.
  • A normal body temperature is 37 0 C.
  • Room temperature reading is 25 0 C at the device.
  • Mode of transfer of heat is of three types- Conduction, Convection and Radiation.
  • Conduction may be defined as the transfer of heat from hotter end to the colder end of the object.
  • Convection is the method of transfer of heat by which the whole object is heated.
  • Radiation is the method of transfer of heat through radiation. For example sun.
  • The objects through which heat can pass easily called the conductors of heat.
  • The objects through which heat cannot pass called the insulators of heat.

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Exercise 1 ( Page No. : 47 )

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