Heat transfer: Conduction, Convection & Radiation | English | IISER Pune Science Activity Centre | YouTubeToText
YouTube Transcript: Heat transfer: Conduction, Convection & Radiation | English
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hello friends today we are learning
about the heat and the transfer of the
heat in science heat is a form of the energy
energy
it is also known as thermal energy it is
a sum of the kinetic energy of atoms or
molecules of any particular given substances
substances
in thermodynamics heat is energy that is
moved between two things one of them has
a higher temperature than the other heat
always flow from the hotter body to the
colder body here
we will be learning the various ways of
the heat transfer like the conduction
convection and the radiation
let's understand the conduction by a
simple activity we need some materials
like a copper rod small nails a candle a
matchbox and a wooden stand fix the nail
on the copper rod with the help of the
candle bags as shown
maintain a distance of about two
centimeters between two nails
insert the other end of the copper rod
into the paper roll as shown
adjust the height of the candle
accordingly to the height of the wooden stand
stand
light the candle and place it under one
end of the copper rod so that this end
will get heat from the candle flame [Music]
observe some time and see what's
happened to the nails
after a few seconds the first nail force down
down [Music]
as you continue to provide the heat to
the copper rod after some time second
nail falls down
and after that the subsequent nails
falls down
as well [Music]
[Music]
if you observe carefully you will notice
that the nail nearest to the candle
flame falls down first then the second
nail and the so on
when we provide heat to the one end of
the copper rod the wax used to fix the
nails to the copper rod
melts down and hinge the nail falls off
the copper rod get heat from the candle
and this heat transfer from hotter end
of the copper rod to the colder end of
the copper rod hence the nail falls down
subsequently from the copper rod this
process of the heat transfer is known as
the conduction of the heat in conduction
the transfer of heat from one atom to
another is accomplished by the direct
contact of the atom of the copper rod
now let's understand another method of
the heat transfer it is known as a
convection method take a small glass
bottle and tie the thread to the neck of
the bottle then put a few drops of the
ink or food colour in it fill this glass
[Music]
slowly insert the glass bottle into the
container using a thread and observe
what is happening inside [Music]
[Music]
you can see the beautiful cloud of the
colored water coming from the glass
bottle why it is happening the density
of the hot water is less than the
density of the cold water when we
submerge the hot water bottle in the
cold water due to the lower density of
the hot water it goes towards the upper
side in the cold water container here
with the help of the color you can see
the path of the hot water
this process of the heat transfer is
known as a convection in this convection
process of heat transfer the movement of
the heat by fluid
such as water or ear is convective you
can make some changes to the experiment
instead of using the single bottle you
can use three bottles and repeat the
above activity if you fill the three
bottles with three different colors then
you will see different color coming from the
the bottles
after some time when the temperature of
the water inside the water and outside
the bottle gate equalize then you will
not find any colorful clouds in the
water tank
now let's understand one more method of
the transfer of heat it is known as
radiation here we are using the
radiometer that we got from the market a
radiometer is a device that measures the
power of electromagnetic radiation in
this radiometer the veins rotate when
exposed to the light with the faster
rotation for more intense light
providing a qualitative measurement of
the electromagnetic radiation intensity here
here
you will find heat transfer without any
medium this type of the heat transfer is
known as radiation here you must observe
the transfer of the heat by the
electromagnetic waves this type of the
heat transfer is known as a radiation i hope
hope
you must enjoy the above activities
involved with heat and the heat transfer
some of these activity you may easily
perform in your home
please do all of our activities under
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