L15 : Compressibility factor - states of matter, Class 11 Video Lecture

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before watching the video please make
sure that you have watched part 1 part
14 let's talk about a new term called
compressibility factor so the deviation
of the ideal behavior from the division
of the real gas form ideal behavior can
be amazing actually because some example
I say that my trojan behaves deviates
more than carbon dioxide add some
pressure at pressure X the the deviation
is different for a different gas at
different different pressures wait so
how to make the division because some
real gas may deviate more than some real
gas may deviate less to compare from the
base idea so we have a term called
compressibility factor to measure that
deviation of a real gas from the ideal
behavior and this is nothing but ratio
of T V by n R also we can find the
deviation by volume which is occupied
real by volume ideal so really they
should occupy X volume in idealization
of pilots suppose Y volume by by is the
beloved that two different ways to find
the value of caseta and also note that
is complexity factor for a given gas
varies based on the pressure of example
for nitrogen at at pressure is equal to
zero you see pressure will zero low
pressure it is behaving like a real gas
the complicity factor is one right so
for ideal gas we say that the Z value is
1 so in this case if you see here it is
behaving almost like a real gas correct
because my jet is going to 1 but for
nitrogen if you see now with increase in
pressure with increase in pressure the
value of Z increases
similar hydrogen object you see with
increasing pressure this value increase
for oxygen it goes down the rad web site
goes down and then increases the visit
pressure for retain the value of Z goes
down becomes the negative and then it
becomes zero once again
and increases here also ABC for carbon
dioxide in the grid goes down and then
increasing so the value of trade also
change is not that the value of Z is
constant for oxygen or nitrogen hydrogen
this value also change the
compressibility factor or the deviation
of the ideal gas also changes for a
given gas based on the pressure right so
see the new form of a shame given the
complexity factor is nothing but volume
real by volume I so there are two values
of community factors explained it can
have a positive value from here to here
but can have negative value also so what
does it mean so for ideal gas I told the
value of Z is 1 when there is less than
1 it is called negative a she's not
negative but it is less than 1 so we
call it a negative value because here
one is considered as the reference so
for it is less than 1 that means it is
more compressible than expected
right that means the gas is more
compressible than expected and you see a
gas like oxygen methane and carbon
dioxide behaves in this fashion for
certain pressure value for example
oxygen below 400 pressure per bar this
behaves like a Z I mean this behaved
like a real gas where z is less in MA
and if is that is greater than 1 that
means it says adding you need to see
that the gas less compressible and
expected so that's what is well if you
the value of 0 is 1 that means the gas
is less compressible in most of the case
it is I did only is there is less than 1
very few case is that - only for sudden
danger pressure if that is less than 1
that means it is more compressible none
right and as I told the value of Z also
depends on the pressure
which if you see few very pressure the
value of Z changes for a given gas thank
you
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