Study Materials

NCERT Solutions for Class 7th Science

 

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Chapter 4. Heat

topic -4

 

 

 

Chapter Review:


  • Temperature is measured by a device called thermometer.
  • The thermometer that measures our body temperature is called a clinical thermometer.
  • The temperature of normal body is 37 °C.
  • The range of clinical thermometer is 37 °C to 42 °C.
  • The range of laboratory thermometer is -10°C to 110°C.
  • The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction.

  • The process of transferring of heat in liquid like water is known as convection. 

  • The process of transferring the heat which does not need any medium is known as radiation.

  • The materials which allow to pass the heat from themselves easily are  known as conductor of heat. EX:- copper, Iron, almunium etc.

  • The materials which does not allow to pass the heat from themselves are known as bad conductor of heat. Ex:- wood, plastics etc.  

  • Poor conductors are known as insulators.

  • The warm air from the land moves towards the sea to complete the cycle. The air from the sea is called the sea breeze.

  • The cool air from the land moves towards the sea. This is called the land breeze.

 

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