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Conduction Convection Radiation
Transfer of heat through Transfer of heat due to Transfer of heat in
touching solids with movement of gases or space or air.
different temperature liquids (Fluids) particles (without any need of
from 1 point to another hot molecules low density material particles)
without transfer of rise upwards while cold
particles from their molecules high density fall “Electromagnetic
positions waves”
In solid materials only In gases and liquids In both vacuum
(Fluids) space and gases
Heat transfers from point Heat transfers upward Heat transfers in
of highest temp. to point from least density area of all directions.
of lowest temp. till fluid to the greatest density
thermal equilibrium
As a result of contact As a result of the Without the need of
bet. solid particles movement of fluid particles a material medium
Cooling pads in fever Cooking noodles and water Hands get close to a
in a pot. fire, you feel warm.
They get hot and rise while
the cold at surface moves You feel the hot of
down and so on. the sun.
First Term 61
