Conduction, convection and radiation

Conduction is the transfer of ___________ from the region of higher concentration to the region of lower concentration without any visible movement of medium.
Heat
 
______________ are good conductors of heat.
Metals
 
Air is a better _______________ than copper.
Insulator
 
Birds fluff up their feathers to keep _________.
Warm
 
Convection is the transfer of heat from one part of the fluid to another by ________________ movement of the fluid itself
Circulating
 
Radiation transfers energy in the form of __________________ which can travel through vacuum.
Infra-red waves
 
Silvery surface is a better heat ______________ as compared to dull black surface.
 
 
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