Question

Define the conductive,convection and radiation heat transfers in the environment

Answer 1

All three are processes of heat transfer through either a solid, liquid or a gaseous medium.

Conduction is a process of heat transfer which occurs only in solids and is quite an efficient mechanism. It requires the transfer of energy in the form of heat by successive collisions of molecules of a solid. No mass movement takes place.

Convection is a process of heat transfer which occurs either in liquids or gases. In this process energy in the form of heat is transferred with the help of mass movement of energetic molecules from one point to another.

Radiation is a process of heat transfer which occurs mainly through a vacuum or a gaseous medium. In this mechanism electromagnetic waves carry energy from a hot body as it spread throughout a media.