L10 : Cyclone - Winds Storms Cyclones, Science, Class 7 Video Lecture - Class 7 | Best Video for Class 7

hello friends this video on wind storms
and cyclones part 10 is brought to you
by exampie or calm no more pure from
exam so let's understand cyclone so it
is a system of close to rotating winds
around a low-pressure area so in this
picture the image which you can see in
the picture that is actually trying to
depict how a cyclone looks like so it is
nothing but these are the winds but just
that the winds are moving with very very
high speed and the winds are moving in
rotational motion they are moving in
this fashion in the form of a spiral
around the center and that Center is a
low-pressure area anyways we know that
high speed winds will always be
accompanied by low pressure low air
pressure so that the same thing happens
here though at the center is a
low-pressure area and around that Center
these winds are like very rotating at a
very high speed
so that's cyclone now sense the winds
are rotating with this much of high
speed so the winds have deep they have
the strength to cause even more damage
so that is why cyclone turns out to be
very badly so let us look at the
formation of cyclone how is a cyclone
formed so before I talk about the
process of cyclone formation let me ask
you a very simple question what are
clouds the clouds which you see on the
sky which later design have rainfall
water clouds clouds are nothing but
water vapor right now think of another
simple concept
now when water changes to water vapor
what do you need to do in order to
change water to water vapor you need to
heat the water so when you heat water it
changes to water vapor so basically we
need to provide heat so heat is required
to be given in order to change water
into water vapor now what should happen
when the reverse is taking place so if
you want water
to get converted into water so in that
case what should happen so it is
something like if you are giving buddy
if you are paying money in order to buy
a stuff what should you do in order to
sell a thing so when you want to send a
thing you are not going to give money or
you are not going to give payment you
are going to take the money right so the
similar thing here so from water to
water vapor we need to provide it but
when we want water vapor to water
conversion so at that time heat will be
released okay
so during cyclone also a similar thing
happens now the water vapor which are
nothing but clouds they get converted to
liquid water during thunderstorm as I
said that thunderstorm is accompanied by
a rainfall so during rainfall the clouds
that is the water vapor gets converted
into liquid water so as per our simple
concept that during this conversion what
should happen heat should be released
and that also happens here so in nature
also heat is released so where is this
heat released so this eat is released in
the atmosphere so when this heat is
released in that most air what is the
heat doing the heat will warm up the air
in the atmosphere correct so when you
are releasing heat in that most fair the
air in that more sphere will get heated
up and what happens when air gets heated
out so the air gets heated up and when
the air heats up it expands it becomes
lighter and therefore the warm air will
start rising up so the air is warm now
and that warm air rises up now as the
warm air rises up what's happening there
is a movement of air involved right that
is nothing but wind so the warm air is
rising up as a result pressure will
decrease because whenever there is
movement of air that means
initially the air was not moving now the
air is moving so basically the wind
speed increased so it has to be
accompanied by a decrease in pressure so
as the warm air rises up a low-pressure
area is formed and due to this pressure
drop what happens so basically now you
have a low-pressure area at one point
and everywhere else is high-pressure
area so what will happen all the air
from the high pressure area will try to
move towards the low pressure area so
more and more air will rush towards the
low pressure area right so let's see if
this is the low pressure area that is
being created so air from all the high
pressure areas will try to come towards
this low pressure area because I said
air all these moves from a region of
higher pressure towards a region of
lower pressure so as a result more and
more cool air will converge towards the
center and what is this Center saying
here is nothing but the low pressure
area that becomes a kind of Center so
all the air starts coming near it so
that's how it happens so if you look at
it this is how it looks this is the side
view of the cyclone but when you have a
look at it from the top you will see
that there is a sentient so inside is
like hollow and that hollow inside is
nothing but the low-pressure area and
around that low-pressure area you have
these winds which are like in in a
spiral fashion in a rotating fashion
they are moving with very high speeds so
this is how a cyclone is formed so the
net result of this entire process is
that high speed winds revolve around the
low-pressure center so high speed winds
revolving around the low-pressure center
that's the cyclone
so you understood it it's nothing it is
not a special phenomenon that happened
same thunderstorms so when during
thunderstorms if there is too much of
rainfall so when there is so much of
rainfall the more rainfall means more
conversion of water vapor to liquid
water so more heat is released so more
air is warmed up so on air will
rise up and low-pressure area will be
created and creation of low-pressure
area is an indication of the start of
cyclone so that's how cyclone happens so
here you can see the here the arrow RISM
indicates the central part which is the
location error so this is about the
formation of a cyclone so when you look
at it from the top view so you can see
the center here and this Center is the
low-pressure area and just immediately
after the low-pressure area you have
that region where there are extremely
fast-moving winds which are rotating
around the center so here you can see
the picture of a real cyclone and this
is how a cyclone looks near and ice
lamps where you have ice and snow
everywhere so they are also cyclone
happens and this is how it looks so see
it gives you a clearer picture of how a
center has been created and around the
center that the like winds are revolving
at very high speeds thank you please
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