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Conduction Convection and radiation
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PhysicsFriday, December 2, 2022 6:36 AM
Conduction , Convection and radiation
Heat is transferred by means of three different process conduction
convection and radiation.
Conduction
○ Definition:
Ans: Transfer of thermal energy upon physical contact from a hotter object to a
colder object.
Diagram:
○ Metal is a good conductor as:
The electrons are free to move so when heat is applied the fast moving energy carrying
electrons spread into the cooler parts and while they move they transfer their kinectic
energy to the molecules by colliding with them so it conduct to other electrons faster.
○ Liquids and gases are poor conductor of heat compared to solids
Solids>Liquid>Gas
CONVECTION:
The transfer of heat through a fluid(Liquid,gas) by means of bulk movement of the fluid
itself caused by the change in densities in various parts of the fluid which is known as
convection current.
○ Hot particles:
Gets heated ---> Expands-->Low density --->Rises up
○ Cold particles:
More condensed ---> High density -->Sinks
Warm air rises up as it is heated it expands and it's now less dense then the upper air and the
upper airbeing cooler is denser so sinks then it gets heated up while the warm cools down so
the cycle continues known as convection current.
○ Land breeze and sea breeze
Conduction convection and radiation Page 1
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