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.

______________ are good conductors of heat.

Air is a better _______________ than copper.

Birds fluff up their feathers to keep _________.

Convection is the transfer of heat from one part of the fluid to another by ________________ movement of the fluid itself

Radiation transfers energy in the form of __________________ which can travel through vacuum.

Silvery surface is a better heat ______________ as compared to dull black surface.