L6 : Gaseous State - states of matter, Class 11 Video Lecture

hello friends this feeding on states of
patra part six is brought you by exam
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before watching the video please make
sure that you have got part one two
point five so in this chapter we'll be
more concerned about the gaseous States
the other two states liquid and solid a
will not be much bothered because the
laws which we've been studying will be
more of the gaseous law so we'll be
studying more about the gaseous state
so gaseous it is this one where I have
my thermal energy means thermal energy
is the winner actually that is greater
than my intermolecular force you don't
wanna force correct so click on the only
eleven element that exists gas under
normal condition this normal condition
is a critical one because if you heat
water also it become gas I'm talking
about a normal condition standard
equation pressure we'll discuss what is
STP the next few slides under normal
condition there are only 11 elements
that exist as gas the force of
attraction between the molecules that
are negligible almost things when you
talk about ideal gas you see that there
is no force of attraction between the
molecules but really there are force of
attraction molecules but they are very
very less and their behaviors are
governed by some general laws we'll
learn these laws in the next few slides
there are some laws which govern the
behavior of the gas right and there's a
property of gas firstly they are highly
compressible the second is they exert
pressure in all equal direction example
I put a gas in this round container so
you exert pressure equally or knowledge
equal pressure knowledge they have lower
density than solids and liquids
obviously because the molecules are on
apart and there is no fixed shape they
can take the volume and shape of the
container there is no fixed volume there
is no fixing you see her case of liquid
there is fixed volume
right here we have fixed volume and
fixed shape here we don't have fixed
volume no examples so you put the gas in
a particular container in degree of
olive and another itself and they mix
evenly and completely all completion
without any chemical aid so if you put
gas one and gas to eat in container
they'll mix evenly immediately you
already do charnot heat heat I think it
requires just mix immediately in all
promotion without any clinically so
before we study the gas thing of gas
talk about gas we will talk about the
mass volume pressure and temperature of
the gas
so let's first understand how do we
visit this mass volume pressure in
temperature I hope you must be knowing
what is mass Valley pressure temperature
just I will explain how much bigger this
balance so fast you know is visit kg and
this is easily this balance also the
mass is expressed in the moles one more
is nothing but six point zero 2 3 2014
anything molecules this is all about
mass talk about volume so volume is this
is this kind of beakers so it is also in
this measure in liters one it is nothing
but one DNQ or 10 to the power 3
centimeter please note this relation one
later is nothing but 10 to the power 3
centimeter cube or 1 DM q you talked
about temperature temperature is
measured in using thermo meter you must
have seen this your house when you feel
sick when you feel feverish you measure
your temperature in thermometer so it is
measure itself degree Celsius DB fire
minor degree Kelvin explain all these in
the next few slides now explain how this
Kelvin came there are three different
units and 100 degree Celsius is nothing
but 10.8 Fahrenheit and zero degrees 270
3.5 Kelvin
then we have pressure so pressure we
have we have this barometer to measure
pressure there to window barometer one
is the mercury one and is the advanced
one parameter so this mercury barometer
is used to be the pressure of example
here you get some pressure air with not
bad mostly pressure this mercury will
rise and from this is a scale here you
can find the readings of the height of
the mercury so height of the mercury and
with that you can find the pressure or
you can use this kind of device the SI
units Pascal but we also use at once
atmospheric pressure atm
and when it was Fisher is 76 CMM cm or
semi 60 mm or 7 C Todd stall is after
the scientist who has discovered this or
one zero one three to five Pascal this
is my Pascal is master unit but eighty
at once lippisch is also used quite
often so this is my SI unit for this and
if we talk about Pascal Asli is nothing
but the pressure exerted by a force of
one Newton on an area 1 meter supply
because I told traces are equals the
force by area so you will learn all this
in terms of physics where pressure is
force by area so I'm talking about when
force is 1 Newton and area is 1 meter
square what you get is one possible it's
over Pascal you can also write 1 minterm
you just correct and the relation
between atmospheric pressure and Pascal
is one atmospheric pressure is 1 0 1 3
to 5 Pascal so all these conversions and
unity should know because you solve the
miracles
it's good to know all this conversion
and it helps a lot with all the limiters
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