Applied Physics I: Chapter 3: Properties of Matter - Thermal Physics
Transfer of Heat Energy - Conduction, Convection and Radiation
Definition, Example
Normally there are three modes by which transfer of heat take from one place to another viz., conduction, convection and radiation.
TRANSFER
OF HEAT ENERGY‒CONDUCTION, CONVECTION AND RADIATION
Normally
there are three modes by which transfer of heat take from one place to another
viz., conduction, convection and radiation.
Conduction:
It is the process in
which heat is transferred from hotter end to colder end without the actual
motion of the particles.
Example:
When one end of the metal rod is heated, the molecules at the hot end vibrate
with higher amplitude (kinetic energy) and transmit the heat energy from one
particle to the other adjacent particle and so on. Thus heat is transferred
from one end to the other, at the same time each individual particle remain in
their mean position of equilibrium. Eventhough solids, liquids and gases
conduct heat, it is prominent in solids since atoms are well bound in their
positions.
Convection:
It is the process in
which heat is transmitted from hotter end to colder end by the actual movement
of heated particles.
Example:
When some potassium permanganate is added to a beaker of water and heated, we
can find that the lower region become warm first and becomes less denser. Hence
it moves up and the more dense cold water comes down. Now this cold water is
heated and the becomes less dense so that it towards upward direction. Thus the
convection current is maintained and the actual motion of the grains of
potassium permanganate can be seen, through the naked eye. Convection takes
place in liquids and gases in which molecules and relatively free.
Radiation:
It is the process in
which heat is transmitted from one place to another without the necessity of
the intervening medium.
Example:
Though there is no material medium between the Earth and the Sun, the radiation
from the Sun reaches us. Here the energy is sent out in the form of radiant
heat waves. These waves when fall on our body induce the molecules to vibrate
and hence the body is heated up. Thus the radiation can take place even through
vacuum. The properties of heat radiations are similar to light radiations.
Applied Physics I: Chapter 3: Properties of Matter - Thermal Physics : Tag: Applied Physics : Definition, Example - Transfer of Heat Energy - Conduction, Convection and Radiation
Applied Physics I: Chapter 3: Properties of Matter - Thermal Physics
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