Physical Properties of Metals - Electricity Conductivity, Sonorous, High density Video Lecture | Science for Grade 6

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makings are also very good conductors of
electricity so they not only conduct
heat
they also conduct electricity and that
is why we see metals are being used for
all sort of electricity production in
our homes so if you if you want to see
it for yourself what do you do you try
to take a wired and unused wire
no please do not plugging it somewhere
and then you start doing all this
experimentation so that's quite risky so
just take any spare wire which is there
in your home and what do you do just try
to remove the upper plastic covering of
the wire because when you look at the
wire from top you feel that there is a
plastic covering on top so see this is
the plastic covering which may be red
blue green or any other colour but
inside what you will see are the
meckel's so inside you actually see the
metals it could be a copper wire it
could be any other metal so these metals
inside they are very good conductors of
electricity so they allow electricity to
pass through them and that is why they
are used for all these kind of
electricity related wiring purposes but
at the same time why do you have this
covering of plastic or any other non
conductor for our safety because if the
wire is a good conductor of electricity
that means electricity is always passing
through the wire so if you touch that
wire there are chances that you will get
electric shock so to protect ourselves
from the electric shock what is done is
the wire the metal is the protective
with the help of another layer outer
layer and that outer layer is made up of
mostly plastics and because plastics are
cool conductors of electricity so that
we do not get shot so that's how we can
say that metals are good conductors of
electricity now if you take this simple
example so if in fact you can try this
out in your home also you take a bulb
you take a bath
and you connect the bulb with the
battery through wires in fact through
metal wires now when you connect it
through metal wires what happens these
metal wires are supposedly good
conductors of electricity now when you
join the wires together what do you see
the bulb glows so here in this picture
you see the bulb glows white because the
red wire and the blue wire they are both
connected so the three ends are joined
so throughout from the battery current
is produced but that is the purpose of
battery that it produces electric
current so that current reaches the bulb
and when once the coming reaches the
bulb what happens the filament gets
heated and the bulk closed so in this
case the bulb is glowing because these
wires they allow electricity to pass
through them because these are metal
wires and metals are good conductors of
electricity now if you repeat the same
experiment in this case where you do not
join the ends of the wire so in that
case what happens this open space in
between this piece doesn't contain a
good conductor of electricity so what is
there in between this in this empty
space what is there nothing but air now
air is not a good conductor of
electricity so air doesn't allow
electricity to pass through it therefore
the circuit is not completed and the
bulb doesn't glow so that means only if
the wire is a good conductor of
electricity only then your electric
appliances will burn and that is why
metals are very suitable for
construction of wires now here in this
case in fact even if you complete the
circuit but if you replace the metal
wire with a plastic wire or maybe with a
wooden wire then what will happen the
bulb will not blow because plastic or
good is a poor conductor of electricity
so knowing this we will also look at
some of the electric safety measures
that we take because we know that metals
are good conductors some of the safety
measures are electrical outlet safe
big gaps to reduce risk of electrical
shock so you would have seen these kind
of electrical outlets and you would have
also observed that children always have
a tendency to insert their fingers into
these outlets now what is there inside
the outlets inside the wire outlet you
will have a lot of wires carrying
current now whenever you try to touch a
wire carrying current you will get
electric shock so in order to prevent
that what is done there are safety caps
available so which looks somewhat like
this so these are the safety caps and
these safety caps are made above poor
conductors of electricity like plastics
mostly they are made up of plastics so
one hat what you do you just insert it
into these holes so that now children
cannot see the holes that they cannot
insert their fingers so they are saved
from electric shock so these are some of
the measures also it is also it is
seeing that electricians where they are
doing some sort of electric air on
electric poles or something so they
always prefer wearing elect the gloves
these gloves are made up of mostly
rubber or or something which is a poor
conductor of electricity so that they do
not get electric shock so now anything
which is a good conductor of electricity
electric current will be flowing through
it so your chances of getting a shock if
you touch them is very high so these are
some of the measures which are taken in
order to protect ourself from electric
shock another important property of
metals are that they are so Norah's what
do we mean by solders they produce
ringing sounds now have you ever given
one heard the sound of your school bell
with concentration
school bell or the temple bells so when
you just when it is Ram what happens up
a sound comes which repeatedly keeps
coming so the sound is very vibrating
it's a strong song so these type of
sounds are produced only by metals and
not by nonmetals so if you want you can
just have a quick comparison between a
metal and a wood and you will see that
metals produce more sound for example
you take your cutlery from your kitchen
spoons forks knives and when you strike
them against each other you get some
some sort of ringing sound which is
absolved of music right right because
they are all made of metals when if you
take few coins you take a lot of points
and you just try to mix them with each
other take them from one hand to another
and you can hear some sound so these
type of sounds are produced only by
metals on the other hand if you instead
of taking metal objects if you take say
some a wooden table so on the wooden
table if you just strike it sound that
will be produced will not be a ringing
sound and that sound is going to be
different than these sounds so metals
produce a sound which which is going a
ringing sound so by listening to that
sound you can actually say if this sound
is produced by a metal or otherwise
another important property is that
metals have very high density so you can
actually feel that metals are very heavy
if in case let us suppose you have to
carry a big box like this as you see on
the screen now there are two scenarios
in the first scenario you have to carry
a box which is a plastic box and in the
second scenario you have to carry a box
which is an iron box so which will be
more heavy I then definitely will be
more heavy and the density in case of
metals is also very high now the more
density means
the molecules or the atoms they are more
densely packed to each other they are
more they are over populated so
obviously they are more heavy also
iridium and osmium have the highest
density so these are the metals with
highest density on the other hand
lithium has the lowest density thank you
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