L13 : Disadvantage of Fossil Fuels - Combustion & Flame, Science, Class 8 Video Lecture - Class 8 | Best Video for Class 8

hello friends this video on combustion
and flame part 13 is brought to you by
exampie or calm
no more fear from exam so based on
whatever we have studied so far we know
that fuels release energy and how do
they release energy by the process of
combustion now again we also saw that
using different fuels involved different
advantages and disadvantages so we have
also learned about the characteristics
of good fuel and which fuels should be
preferred over others now when we spoke
about the fossil fuels the most commonly
used fuels that is coal petroleum and
natural gas now it is also important to
know that these fuels can be harmful to
so the it is not only the advantages
which are associated with these fuels
but they can be dangerous as well so let
us look at that these advantages which
are associated with the use of fossil
fuels now some of the disadvantages the
first one is that it causes severe air
pollution because when you think of
fossil fuels what are they so that three
common fossil fuels are coal petroleum
and natural gas right so when you burn
any of these you burn coal a lot of
smoke is produced a lot of poisonous
gases are produced carbon monoxide is
released carbon dioxide is released and
all these create air pollution and air
pollution has serious health effects on
all living organisms so air pollution is
one disadvantage associated with fossil
fuels and it is a major disadvantage
second is it can cause acid rain now
these kind of oxides which are released
as a result of combustion of these
fossil fuels like oxides of carbon
carbon monoxide
dioxide nitrogen oxides sulfur dioxides
now all these oxides are acidic in
nature so if you remember again the
lesson on metals and nonmetals where I
told you that oxides of nonmetals here
these are all nonmetals carbon nitrogen
sulfur so they're oxides are all acidic
in nature right so these acidic oxides
so where do they go they remain in that
removes fear and when it rains they mix
with the water droplets and the rain
becomes acid rain because the rain also
becomes acidic in nature and this acid
rain again has a lot of adverse effects
on monuments they cause blackening of
the marbles they also have serious
health they also cause serious health
issues in living organisms they also
adversely affect the growth and
productivity of plants so acid rain is
also something which is not at all
desirable it also causes greenhouse
effect what is greenhouse effect
greenhouse effect is that phenomenon in
which the greenhouse gases and what are
the greenhouse gases carbon dioxide and
methane so these gases what do they do
they tend to absorb more and more
infrared rays and as a result the
overall temperature of the earth
increases so greenhouse effect actually
results in global warming
now how fossil fuels contribute to
greenhouse effect because burning fossil
fuels release these gases so it
increases the content of greenhouse
gases in the atmosphere
therefore greenhouse effect increases
which in turn results in global warning
so overall if you see using fossil fuels
definitely gives us a lot of energy
which can be used for various domestic
and industrial purposes but at the same
time they have severe effects or severe
disadvantages associated with the
environment and if we are getting
benefit by harming our environment then
there is no point because when the
environment gets polluted it is end of
the day it is we who are going to suffer
so we should always use these fossil
fuels very judiciously we should use the
only to that extent which is extremely
necessary so coal and petroleum should
be used to judiciously so that they are
left for our future generation and also
because if we use them in excess right
now so the environmental effects will be
so much that their advantages will fade
away in front of their disadvantages so
some of the wheels by which we can make
judicious use of energy is prefer stairs
over lift because stairs would cost
electricity and electricity is generated
from I mean for electricity we use
thermal power plants and they are
dependent on energy from coal so
basically if you are wasting electricity
you are actually wasting process fuels
prefer to blights over bumps again to
save electricity prefer cycling over bus
because bus would run on diesel or any
other day that would run on petrol or
diesel so if you do not use them and use
cycle so you are actually saving that
fuel pay for bus over car because a bus
can carry in some 50 people and a car
make handle just one or two people so
that is using a bus is more is more
advantageous so so some simple things
which you can do in your day-to-day life
to save energy which in turn will help
us to save to reduce the usage of fossil
fuels which in turn will keep our
environment nice and clean and safe for
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